Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c979f8253face9c…

MALICIOUS

PDF

41.5 KB Created: 2021-06-24 14:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992d06e467e9f98e0af6ec559d194dae SHA-1: 18734142cca109227b9199f3285384f73065f49f SHA-256: 4c979f8253face9cc8b838fae1aca72dccf54786022aeba8ed49165863aacecf
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a screenshot disguised as content, with embedded links pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external URLs for potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8493

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 41 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://nomylo.ru/uplcv?utm_term=europe+blank+map+with+answers
    • https://mauspro.net/upload/files/burotofilinalobamopezin.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be2f7c46ae---mirolegujezogeregari.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/db95dd335048375f462899eb569f90df/85033313685.pdf
    • http://abc-tel.ru/data/File/sanazetekizimi.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608925d6b3afb---85572180051.pdf
    • https://atpl.aero/ckfinder/userfiles/files/vasixutasobivexopobe.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c708a759407af5b355eb1aeca362fa66/gavizadiluki.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cd874f82---56208794190.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823d9b3a70b---58113094224.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df26e7d836---pikuxid.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070f88618e0f---57532446418.pdf
    • http://adabaskimerkezi.com/upload/file/91399826788.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2b7bd6a027998ff10ccb4d9177eb16be/14685444945.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dd174e42d12b39ad3aca8ad03c9312ae/73046083157.pdf

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