Malicious PDF — malware analysis report

Static analysis result for SHA-256 432b7f63fed8e0e1…

MALICIOUS

PDF

98.5 KB Created: 2021-09-05 02:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c4683ed64a03aef53e5407b1807cd67 SHA-1: 48510ff6579c9150d03dcf28a93491b5be2caee4 SHA-256: 432b7f63fed8e0e1fbd5b2d1eac920e95e3eea3583e3f9e75ebe4d92a550562d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs for SEO manipulation and distributing links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5653

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=karl+marx+critique+of+the+gotha+programme+pdf
    • http://hiddenroots.org/clients/19739/File/nofabe.pdf
    • http://bagiez.de/userfiles/file/20536374405.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c18af81d8b1f92a1cc67f604918fc4b8/kopamikefoz.pdf
    • https://global-product.org/CKEdit/upload/files/zizod.pdf
    • http://chinalabware.ru/d/files/86035113017.pdf
    • http://pathtojanna.com/userfiles/files/dulupudumuz.pdf
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20252119293.pdf
    • http://tanphatinst.com/vietkiendo/upload/file/58131123018.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ddfaeb9c---47779495499.pdf
    • https://baxsporthorses.nl/userfiles/file/reverebujataxag.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70497225f---9057032733.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/miturubilixotugejo.pdf
    • http://drentmedischadvies.nl/uploads/files/mupagezobadezog.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730bb69bfdd---1119384773.pdf
    • http://syuncyoku.jp/upload/file/2022616989.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunepevezone.pdf
    • http://batterseataxi.com/survey/userfiles/files/sadub.pdf
    • https://tecnibat.net/uploads/archivos/32150342251.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cff69b224---58735737955.pdf
    • http://studiocinti.eu/userfiles/files/16060019750.pdf
    • https://mamo-tato.ro/userfiles/file/gikosobotar.pdf
    • https://abugfreemind.com/userfiles/file/88627750033.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/132c42d6179194a1f692d9ff7b7d18b5/tabegodatexewunej.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/64091059014.pdf

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