Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aee50a540b7f7fe…

MALICIOUS

PDF

54.1 KB Created: 2021-09-08 01:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79a2073c03c170ba6e38c12e130700e0 SHA-1: e5a50a4f4ba534a4cdae65ac6f45b0f1aa862622 SHA-256: 7aee50a540b7f7feb52105a4e8f3e79bf7736b0b108ae3443b6cf3e48550f3d3
154 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6465

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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56828b620---bigiwiwuk.pdf In PDF document text
    • https://alshaabcoop.com/userfiles/file/91024791634.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/koxizuwu.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67782137989.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/nimamorunewofoneromipe.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///vumugovoruge.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8337e8975eb3cc512b51f0c615f333fe/43952978490.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7348d73069---jirozowupujifokuj.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/62472997878.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/72132260957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=digestive+system+of+a+chicken+parts+and+functions+pdfPDF link annotation

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