Malicious PDF — malware analysis report

Static analysis result for SHA-256 1685ac599edd28e6…

MALICIOUS

PDF

63.6 KB Created: 2021-06-10 01:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f94842433523ee8c7a6b88ee3f14842f SHA-1: 37da15ab14eb24a62e3ea39a4cb90a8288faed08 SHA-256: 1685ac599edd28e637c004ac11d9f2562339c87bfbc485d3fbdc8b7531d0af1a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV flagging it as a phishing trojan. The document is an image-only lure, typical of phishing campaigns, and contains numerous links to external websites, many of which appear to be compromised WordPress uploads. The primary purpose seems to be directing users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7475

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 63 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=munna+michael+english+subtitles+full+movie
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd25090b23---xaxafigakelamogesuba.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beefdee08e1---43853115500.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/45b6b972aac14d88cc70e27d8a7551f5/7004385877.pdf
    • http://vita24h.com/uploads/userfiles/file/kemedupufisidexofedumodo.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0848ebdc---povasuruxebur.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j4ejj3j9hedje8e0t1ta2l6693/bovugoxudivanumaxete.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/luvizovuxerota.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/50bd8e44530335908d362225ad38a924/jopukukaduduzibizidigako.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/b71knhn48guolhfpinqgq53hbe/49565005026.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/7974469899296e0d4f4ac1e5b7d0f396/62916006462.pdf
    • http://www.aqsclimited.com/EditorImages/file/92917899296.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/05067342540311124325e4a12cdd01c4/notaxada.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3e4488b3d203bdb5a3db39b452a962a9/16755871519.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a1c1e2dd---firewirituvetisevi.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/pumatuduva.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2476aa36---32299894366.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b74138b2---10267800369.pdf

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