Malicious PDF — malware analysis report

Static analysis result for SHA-256 056721d5bb93eae8…

MALICIOUS

PDF

60.9 KB Created: 2021-09-12 08:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3afcdbc2b47dc7ea73e57778ab7bff46 SHA-1: 655857c772f72a32393f64825142515ac3a54e99 SHA-256: 056721d5bb93eae8181c0d6dc0707b6cc12126b40b6c62096b2d83bfb4a479fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8776

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 https://cructi.ru/uplcv?utm_term=latest+app+for+android
    • http://sql110.com/pic/61800261323.pdf
    • https://samoinstitute.mn/uploads/assets/file/19788193176.pdf
    • https://airflow-skateboards.com/userfiles/files/xexujifat.pdf
    • http://aid-calais.com/userfiles/file/93532098810.pdf
    • https://hongmao.tw/uploads/files/202109100953295518.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/16a87ca13bf83355b50ce91d597f5efd/rubitabalesepesisosoligez.pdf
    • https://giaiphapthietke.vn/media/file/files/jopumubev.pdf
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/wataroledalegefa.pdf
    • http://tavio.su/files/file/sexedawawikibatu.pdf
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/lurigorefisuxemuwibeg.pdf
    • https://dom4m.by/userfiles/files/nijiluromejo.pdf
    • https://chrmglobal.com/userfiles/file/65950469909.pdf
    • http://demenagements-remond.fr/userfiles/file/20210911211947.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/27138086401.pdf
    • http://studioambienteterritorio.it/userfiles/files/pedowubibuvifole.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9df8a3b285e9cc0a81d882575ac96248/69722967261.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134d185d628a---kitutotaxerinapul.pdf
    • https://easy2ticket.com/upload/files/roketopap.pdf
    • http://gazosilikatnn.ru/uploads/files/sunumezabezujuvevuretug.pdf
    • http://abwbaltimore.com/uploads/files/61729023762.pdf
    • https://coastalstudio.com/images/main/file/xezarekuf.pdf
    • http://gusanhightec.com/userData/board/file/5768786053.pdf
    • http://articolo17.it/siti/usr/foto/files/xalixidegur.pdf
    • http://cargologicru.com/sadm_files/pezadusesinit.pdf

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