The Japanese keyword hack is a form of SEO spam that creates or exposes large numbers of unauthorized pages on a compromised website. Google results may suddenly show Japanese titles, product listings, brand names or URLs that the website owner never created. Some spam pages are visible to everyone; others are shown mainly to search engines or visitors arriving from search results.
The problem is not only cosmetic. Attackers may generate thousands of crawlable URLs, alter sitemaps, inject database records, create hidden files and use backdoors to rebuild deleted pages. Effective recovery requires removing both the spam output and the mechanism that produces it.
How to recognize a Japanese keyword hack
- Google searches for your domain show Japanese text or unrelated products.
- Search Console reports sudden growth in indexed pages.
- Unknown directories or URL parameters appear in crawl reports.
- The website serves different content to Googlebot and normal visitors.
- Sitemaps contain URLs that are not part of the real site.
- Spam pages return after files or database rows are deleted.
- Unknown administrator accounts, cron jobs or PHP files appear.
A useful first check is a search for site:yourdomain.com combined with unfamiliar words or URL patterns. Search results are only part of the evidence; server files, database content and access logs should also be reviewed.
Why deleting the visible spam pages is not enough
The displayed page may be generated dynamically from one small loader. Another script may recreate deleted files or submit new spam URLs. If attackers still control an administrator account, hosting credential or vulnerable plugin, they can restore the infection after cleanup.
The cleanup should answer three questions:
- What content or code is unauthorized?
- How did the attacker gain access?
- What mechanism allows the spam to persist or return?
Japanese keyword hack cleanup process
Preserve evidence and create a backup
Record examples of spam URLs, Search Console warnings, suspicious files and modification times. Keep a backup of the compromised state before removing files so that legitimate data can be recovered and the intrusion can be investigated.
Identify the generator and entry point
Inspect CMS files, themes, plugins, uploads, server rules, scheduled tasks, administrator accounts and database tables. Look for cloaking conditions that serve different content based on user agent, referrer or cookie.
Remove spam content and backdoors
Delete confirmed malicious pages, scripts, injected database records, rogue sitemaps and unauthorized users. Replace compromised core components with trusted copies when appropriate. Check other sites on the same hosting account because cross-site reinfection is possible.
Return removed spam URLs correctly
Unauthorized URLs that have no legitimate replacement should normally stop serving spam content. Depending on the site structure, they may return an appropriate not-found or gone response. Redirecting every spam URL to the homepage can confuse users and search engines and does not prove that the compromise is fixed.
Secure the website
Patch the vulnerability, remove abandoned software, rotate credentials, review file permissions and enable stronger authentication. Continue monitoring for new files, users and unexpected URL growth.
Support Google recovery
Submit a clean sitemap containing only legitimate canonical URLs. Inspect important pages in Google Search Console and request recrawling where appropriate. If a manual action or security issue is present, follow the specific review process only after the underlying compromise has been fixed. Search-result cleanup can take time because Google must revisit and reassess affected URLs.
For browser warning recovery, see Google Red Screen Fix. If the infection also affected tables and options, review Database Malware Removal.
Frequently asked questions
Will the Japanese search results disappear immediately?
No. Once the website is clean and spam URLs return appropriate responses, Google still needs time to recrawl and update its index. The speed varies with crawl frequency, the number of spam URLs and the severity of the compromise.
Should I block all spam URLs in robots.txt?
Blocking URLs can prevent Google from seeing their updated status. The right response depends on how the spam URLs were generated. Remove the malicious content first, then choose crawl and removal controls based on the verified URL pattern.
Can a clean backup solve the problem?
A clean backup can help, but restoring it without closing the entry point can lead to reinfection. Credentials, vulnerable components, server-level persistence and neighboring sites should still be reviewed.
What should I send for an initial assessment?
Send your domain, two or three example spam URLs and screenshots from Google or Search Console. Contact Fix Site Fast on WhatsApp for an urgent review.