Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f677f0bd54579d4…

MALICIOUS

PDF

55.7 KB Created: 2021-05-15 20:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5a6aa63ddf91b871c16e536a4a927041 SHA-1: 9f05701b8a1773caa2698fba90302859f669aecd SHA-256: 2f677f0bd54579d448718699458428459058e6b0d58704b79fbdf60c2b2d2a72
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these external links. The document body's garbled content further supports that the primary function is not informational but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://medvor.ru/uplcv?utm_term=master+of+business+administration+thesis+pdf PDF link annotation
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/82l08tosrdk8ro05on7f4o6q9g/66309779345.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/16735344827.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfcd2125b3---57898216952.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/pokesidibamadida.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c341fb100b0c0835e8add5158827ebf6/9086535818.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763cb830421---tamupuxuvubiwidogoxuxafed.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a9baeb5e---87500788189.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec4221a66---buletazedinuma.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5b63d117---magurabuvag.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160781510538a8---dofuxelepiwe.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3408537f---37892716316.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85523b0d1---foruwofosoritan.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd85ce6daf---67526821284.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/rajajolamuwizotozo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nazetexuxezetarapipi.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/of3v41ouar2l81rb59g30atn8g/zadexediwup.pdfIn PDF document text

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