Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bef26fcd4bb0af…

MALICIOUS

PDF

70.9 KB Created: 2021-06-24 19:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8d331fc24f71cbc348e2cb08fc28ce1e SHA-1: 00a892036b15f6ff1c3a44fb3746bdacb3ba5793 SHA-256: 38bef26fcd4bb0afb13da38253326336ed5f9b285c16c88554821d3c9ebabaad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7721

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
  • 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://av-jet.ru/userfiles/file/7853883315.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/fiteg.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2a93e1f7a1022554554e6dc779694f75/wonorowonudofuzolinaz.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/kokupol.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/5431022089.pdfIn PDF document text
    • https://stopserv.ru/files/file/54184092212.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f714927bc73fc4872cee445b9999a198/39971568666.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/pvtqomabas2l3h5nfh05k6t6jg/xebiwusobudix.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/43b4ac1c9d929a3b7ac696ab5aa0dcab/zokojet.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/71956442640.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/19353740631.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6166ab93c3---14637443613.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5l10c3b8aj6sfeb1aor7ogqr46/63655914731.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/gisululazizukuxo.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/wadefeguri.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2710bfcd549f0205c814d9b164c7f201/tifiresonadikoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bosch+wta+4100+manualPDF link annotation

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