Malicious PDF — malware analysis report

Static analysis result for SHA-256 261c6d5f54d6093f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-09 23:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 34bef8bbdb3e00f5c7f05bfb3e3d486a SHA-1: a809b78d4e1878a0d1340b594beaa9a48c8628b2 SHA-256: 261c6d5f54d6093fc585759faa1dbdef707c638951425f7f50811455de7e5e5b
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic findings strongly suggest an attempt to trick users into downloading further malware or engaging in phishing activities.

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://crysiq.ru/uplcv?utm_term=headway+pre+intermediate+third+edition+pdf+free+download PDF link annotation
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5420056f56db533af96f0313cbec1794/94073537856.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/70741725750.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/vulafiritotomu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/38ab4ab62b513824b6e465196a567415/50695244231.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9cf7f86e---pugivuz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i975g0ola9nspcs39nko3cdie2/xukufo.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/gekugipen.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03e3ba0a8---79032804004.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/62874837519.pdfIn PDF document text
    • https://fallsplat.se/file/depuxuwamirip.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nelenazomasu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b591a761ec7---remavuwegogifuruxo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/03407ad1cb58dd3411e30d23baba6e35/95919554255.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05be91314---zagadimilewaxojijejir.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d13b8b07fecd6b89904af2aa37605f88/19903152278.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/kezexonikepubapukurefeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 5260 bytes
SHA-256: 88835fd7135c44145d83d6785c605d9b625d157ae6b1043adfe1eda9bf82e2ef
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 15636 bytes
SHA-256: c45b03f1cd17338afb92921af9adf2e1c6a8c301682d8049e51a62f74c650d91
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 19224 bytes
SHA-256: 3cde3f3a844414602eb3b2fec6808a713471555bc14bc254d773e4367133a065