Malicious PDF — malware analysis report

Static analysis result for SHA-256 46108dfb62145e19…

MALICIOUS

PDF

48.4 KB Created: 2021-06-19 01:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18ce1a8a0fe3de51038f38532b2934ca SHA-1: 8326f5573ffe5d0c8e3b53803d9ef7bdb2cb3b74 SHA-256: 46108dfb62145e19bc6e2ef26e9ccf201603bfc7c962a01c38d7ead264f812ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, indicating it was likely generated programmatically. The presence of numerous unknown URLs further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7327

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 http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bca28380---fisuguvi.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1587ab9a5---vajibenek.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/5283228595.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/faganejekupego.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/wubazizejin.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9198516562107e2c77bd745dab4674b1/53103281867.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/016310f73fb59dab6d15b62a5ef6021c/66506841352.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/totiwewo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2fd19643---28003241237.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c7de87e8---39872975886.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081343af06cc---fagototujemulo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b1c6d0bb---70324857394.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/85768156445.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d08f90d9c93a675c5c297c53895b92ce/8760151161.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/rizefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=strategic+thinking+performance+review+phrasesPDF link annotation

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