Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2e85488022925f…

MALICIOUS

PDF

54.6 KB Created: 2021-08-23 10:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7806e5c47c4871392a2b40a73f3abc0f SHA-1: a5eb7f2bcccbc1f4f94bd660fcc46b9cf09a3292 SHA-256: 4c2e85488022925fd68a560c5e406c1a7ef695d685d0ca51c243b27078e1bed6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure, likely intended to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7256

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 https://coretry.ru/uplcv?utm_term=meatloaf+and+gravy PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cd97b565---vukosebiz.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c314f5cf5e6---71271337276.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/94660393699.pdfIn PDF document text
    • https://senhewood.com/d/files/lazisajejubawaxagixudajad.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tbs3o9orc28vfkvie3b9q6dsb2/90529104131.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zabuxupij.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o3hiknen29ct0jds0pu0k1hbsq/95107117054.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1fde6e05b428eca40eb3dc8de1675f45/misixugujakegisa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/fIn PDF document text

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