Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10694fbb1b0758c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 12:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e8dabcd3a1185caf447e67aff5cc05f SHA-1: 341bdee68dced1822e56157cc9fe23cd8c7fcd74 SHA-256: d10694fbb1b0758cbb6f0056200da472c73f8a9503dfd21e236a93964304f5a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users through deceptive content, likely related to file conversion, to ultimately download or execute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laborke.ru/uplcv?utm_term=conversor+pdf+para+word+editavel+gratis PDF link annotation
    • http://sevimticaret.net/userfiles/file/jusubiz.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/vakifafe.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9863eff9a5fa87e158a08d2b81b2f736/wopuguxoxiwonaso.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089f54c404a1---17156205346.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/1845493468.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/fikukotas.pdfIn PDF document text
    • http://one9five.com/userfiles/files/68310328952.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/788c2f0162e225d34d7fc3fe69f22107/64497845143.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3f5cf55d5bfe3499ae0fa1dbdd9e36b2/40191395595.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133220689f---tigosuzanejamabibiwi.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/tezapakaxubokerexi.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/7565778426.pdfIn PDF document text
    • https://redac.ch/upload/napajixovenirofajivaf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161001c0a7b710---84062276070.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/91990564265.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/tasevifivimu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/rawuwavo.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/37732081609.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/vazokivadubogelo.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/60592692604.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86720044703.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/gelufofig.pdfIn 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://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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 17332 bytes
SHA-256: 6602bbf739eb6ae730a0576abd63033d47d3153e552b00573a7573fb6a11ed06
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10856 bytes
SHA-256: 6ac78311be0cfbc394bf2d776d32b591d0b9eceb593998be69ffc2b8a9b6e54f
font_02_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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