Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d56f9b1a72d81f…

MALICIOUS

PDF

37.0 KB Created: 2021-05-28 15:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf070298a9837f0cd4ee035d23f65774 SHA-1: fe2ca062078e5446d53703389c2d2392d5b15db7 SHA-256: 83d56f9b1a72d81ff461f0bf79f6d00bc470deaf5ca9e45e53afee16e3317764
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing only an image and a clickable action. Multiple URLs embedded within the document point to compromised WordPress sites, suggesting a distribution mechanism for malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5974

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
  • 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 37 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.
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22cbf2962---4240275343.pdf In PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/zukigonezaleziwupujalagon.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946417d1659---20439906298.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/df4b5a7741afd2c9a447548082da129a/dematuvexaja.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/31891709682.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9iaphnajd0qs7kdngr9gu43bk5/17221956314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+arte+da+eletronica+pdf+download+gratisPDF link annotation

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