Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5408fde1db0f4c…

MALICIOUS

PDF

54.9 KB Created: 2021-06-17 05:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fcba954fb8820fe9a6cc76eaeae02fcf SHA-1: fabb3442e281258a18d9fdfa218444ae4af92b55 SHA-256: 7f5408fde1db0f4c48ed94d0392f14a9558b98ef23c3597c639a29436d2ea97c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is detected as malicious by ClamAV and an ML classifier, and contains numerous links to compromised WordPress sites and disposable hosting. The document body, though heavily obfuscated, suggests a lure related to academic search terms, likely to trick users into downloading further malicious content. The presence of multiple embedded URLs indicates a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7444

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=teoria+de+las+emociones+vigotsky+pdf PDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a40da765a2538ce11f521186fde86bca/paliwiguvimogufigux.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c8f34470---67838118606.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/56393897858.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c88d79e5---73078825818.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a396b879b9e---joluzudekopug.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/rojolujifumulewerinak.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051514285973499.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/pedoluvelaraxivumid.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/vosifefuzafet.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gadevove.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/67f8e99bc2c91990ab9b7089409fa226/43374376316.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e887e0bf0---ruxidiwepagiwegojenifara.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5e3f7c0c00ced344d4c6afea22db42e8/vamosububud.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/vkpq0rrmlc0achml9l7kq7jq8c/voxunanovotugalakexezod.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3f71bed897b34813a969e89c594c2b02/xeverewewabomiwu.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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