Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcd6b779952f188…

MALICIOUS

PDF

59.7 KB Created: 2021-05-08 14:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 772b9e35c50efbf4bb27e79a5326626c SHA-1: d41e41d6966898781dd4597cfce69c3ab2e559a0 SHA-256: ffcd6b779952f188c92c166380738002a59d46a064d2d75aef76eb94a95bf773
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ML models and ClamAV, indicating it's a phishing or trojan delivery attempt. The document body, though heavily obfuscated, suggests a lure related to 'beneficiary designation form wells fargo'. Numerous URLs extracted from the document point to compromised WordPress sites and other domains, likely serving as landing pages or download sources for malicious payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of distributing links through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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://medvor.ru/uplcv?utm_term=beneficiary+designation+form+wells+fargo PDF link annotation
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/26f9958903419fe1133a7744712efcb7/6841482297.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377054023f---kodijogigukuxeme.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607208192514f---51563070485.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa420ce12f---68689984033.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966faf5fd1e---lamokitafexejuvezip.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607029440c4bf---88572699677.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16086f4b662ecd---tofapimigovegasujinex.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nflfuvevn11fcmnpl9h0cf80pj/8664285580.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fc0c4ffc---fowefavoxabepavu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf760ea996.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7e1d8528---45436426914.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088662370ee8---69498928816.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c367cde5---12967493296.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b7b5f8710bee8edd58f24feee4bb758/fovenomevuwutaxakom.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dujovokomapew.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0d00aa75---58931799065.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bfba39b7b---18119512736.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec094577c6---bezejuxipetig.pdfIn PDF document text

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