Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b886b7433c5cb5…

MALICIOUS

PDF

68.7 KB Created: 2021-09-02 23:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 068270ec9db67bcb06d2c32e82ba09bd SHA-1: 4fa818c0c512c25e1a3c6dfc53bda2ea5dabc9e9 SHA-256: d2b886b7433c5cb591671b2b56b6cc5318939174c4fe2f6a0f69f4f71cc89210
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. The presence of multiple compromised CMS upload links indicates a pattern of hosting malicious files on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8160

Heuristics 4

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=rationale+of+the+study+sample+pdf PDF link annotation
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160913ef276990---sevesezatanaluxapat.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d95a49b33---72609246613.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/95007814256.pdfIn PDF document text
    • http://idcla.net/upload/files/fabedanikosusopuga.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/94007831593.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a849f78b306---tarelufexanajufip.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210624_D12B11410768DEDC.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16120beb300f53---50016619065.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/puzanoniritu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b6fa057b40de11446e7cb682c63c1c6e/rawofedu.pdfIn PDF document text

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