Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c72b94458e69c3…

MALICIOUS

PDF

58.5 KB Created: 2021-05-27 00:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f407a4bae041774a7ab69a9f2b7ebab6 SHA-1: 113930caf2d5f8994779f72c90efd8a4223128fa SHA-256: b1c72b94458e69c34db022fb355cda8cea686be69cf37a356e146bead41b8b07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, appears to be a lure related to assembly instructions, likely to trick users into clicking the malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9595

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://oniceh.ru/uplcv?utm_term=realspace+verismo+executive+high+back+chair+assembly+instructions
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c44d42d3e---pikuku.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608925a97e9c9---ruvejewovo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608296f232c7d---jozimofudadiwininobepixa.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/69514bfafe0d96192dfd961b9c34ced7/71222371331.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9e4c4a6c---41552998280.pdf
    • http://apcmagon.com/userfiles/wapomomupof.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1038f2150---77053810352.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d04b0124ae8a75b646fd9daedd453269/jipojozavipojife.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4b69784f---luzajewerideradurosot.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b71292c81f03794dd7d9f1f1db18d264/lebul.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8d337720---fosizezuribejero.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080aed88f20c---462363598.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/393f33800dc0d4dd7a4628b1b3b82eaf/49466728196.pdf
    • http://beiwendq.com//data/attachment/file/pajilu.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082129165daa---fubitikukoreb.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b609770ec8---ligimutizozagebudolig.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2fcd5dda---lutaxedidumigonudimelu.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ll1ef424sknlrkhk79s8frku6e/57571453528.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f8.bin
b674e7072abcc75acc10a83ebf36bf465b67c9c2449bbdbf006b3f2e33fba078		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 5788 bytes

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