Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b1ddaf61157afd…

MALICIOUS

PDF

62.5 KB Created: 2021-09-05 11:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9356c49965a1e8fdc029ab14cae03130 SHA-1: 8432290aa4e28ffbf3f13afd06eea34467959b10 SHA-256: b3b1ddaf61157afdd31ad93ae1683b62cc5340a8c1faee8dcad7f45e7f11677f
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

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://abwcolley.com/uploads/files/40659794911.pdf In PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/0dd84a6777c2f1a0e95796940b3bc9bf/girureza.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad1cd4762---rekegabanulekox.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/28473020443.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/fegizofatonelot.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a2ad1f0d5145cd0e168118bf83f47917/lesemidewudobija.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/49012267778.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/47b9b950080b05a93fe8c62941c45c37/pabigiwijowoz.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bede9b54066eedd303b69a3cb199f01f/8946397569.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/17f79mf2qaksg9q5sfjt63qmh9/23651992464.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/43d8sscje4o41qsvpiq06bd0k4/xazezemipedujexiwa.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/zusurejove.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6n1gtiege906fdkjnumr70bh8g/zujabirus.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/97541564334.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/83584604413.pdfIn PDF document text
    • https://termoformat.md/img/files/13625655102.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/35368663885.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cbf0107ca---88762829748.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/feda730f26090aa4c3ab53db7786ad20/fudipasikosa.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s7e5slcvdg0c8hdnikocq305o5/pefijufijijowokaxonukunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+printable+writing+worksheets+for+first+gradePDF link annotation

Related samples 8

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