Malicious PDF — malware analysis report

Static analysis result for SHA-256 40956eaaacffc5bb…

MALICIOUS

PDF

55.6 KB Created: 2021-07-20 20:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88e725c95cdd15f88ddf2815d35fd6b9 SHA-1: a4aa13c1d7646a79892f81e315fcf0c10ec40133 SHA-256: 40956eaaacffc5bb9d7c5955bcd72a7d3e3dc09e8d5148ff68cd01691766b174
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were extracted, the structure strongly suggests a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5388

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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bgfofr16hm7911n5bi9dljfpu7/teperinibogufawomabafamob.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/43d32afe1b2bf05f5e62322e3d5a4144/94583849583.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/ad29804d21239ed9000f0492807c3377/tigofalibavul.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160848bef47793---63626167717.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607883c13feac---20583814165.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/ramevanewedilop.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/32fab644795df50fd43cea105113fcdd/23211404908.pdfIn PDF document text
    • https://oliogalanis.com/file/22158953853.pdfIn PDF document text
    • http://ozari-ua.com/files/file/lufipomivuxafanufa.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/jugebe.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/96494438552.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/obi6ubtrv4v1it4na0m59kkif4/lesegu.pdfIn PDF document text
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/98811463173.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3e194a9e---47404698225.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9iffoh4lchrpk27150uuq1gmhv/31880189978.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/73036751406.pdfIn PDF document text
    • https://aedwea.com/upload/foto/41118436964.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb374a6b53---62821690824.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/94586514018.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ee906118---ribaxezem.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/154ed64d34f06aea80db0046ca3b30d4/wasuludusabuzobowelefixe.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p9hrnpig7os0a2u9vbjug4o8a5/dowovavatibolakuf.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23413098320.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16091228622ca3---97961282829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=long+river+chinese+schoolPDF link annotation

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