Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a5a8a09e7e8b2a…

MALICIOUS

PDF

78.6 KB Created: 2021-06-14 06:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9228a9ed88c4ff900878f2768e852d61 SHA-1: 17bfd65eb29995b2f866b4b7993fa33069a340fb SHA-256: 67a5a8a09e7e8b2aeab1e8ae745643801acefb19fa82e3d01a87c369d2b36946
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'virtual dj free download', aligning with the lure observed in the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://huntic.ru/uplcv?utm_term=virtual+dj+free+download PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/910bda18ed61a3cab37814376057bb82/1352189173.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3584acaaf4a689af3fd01dd424a277c1/pibumubanotulowosat.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/sisukotariwetugimure.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070695363882---zewon.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a310a15cb---26280976425.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4fbc2bcc7---24738787476.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/88473631579.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a12202d92a0---77758218750.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/nosuwarinuzulonuz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/77cbd149f782a3ff28d7d9061669ae9c/tojirafulujazo.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/sekobokese.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/585d1199608b01e429374ca1832637b0/59319129409.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ff3e832c---kunaxaligaga.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed913507d0---21705478827.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ed216cb8---xurutop.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/gmitc5tia9d5inicjqn4sadon6/mefivanefa.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e937d8eb8420dee079e5d1f6f7a2a750/53061118359.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ttqmhdmaf42mn1a1et3btneerm/53118861969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 4740 bytes
SHA-256: a748245e64941e9f7385ef6f0ab8cdc8f1baa861d12ed522b2d39d7ae7533542
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 12104 bytes
SHA-256: a80141b14b4b27aad56a39b6b3e7776472dd2372e378e1e3f4c38788a53d4c7a
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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