Malicious PDF — malware analysis report

Static analysis result for SHA-256 2035d51fe2c42c97…

MALICIOUS

PDF

85.6 KB Created: 2021-08-04 16:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b751e5dda95ee0cb4f6e206c6fac165 SHA-1: 5f461a58d025b6182039069180681c7c85ebb679 SHA-256: 2035d51fe2c42c970af2619fbe0a39f2e88310703e76d8a66a4cc2d022825ed7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. The heuristics indicate it functions as a link farm, potentially directing users to malicious content hosted on compromised CMS uploads or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://uzunlarpeynir.com/dursun/upload/files/43550750857.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d73b4fea---noparesizubixinedojasa.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/202688254.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/2f5j7pq1cqtina0mb77lmmer6k/jutigalutanoresutixefer.pdfIn PDF document text
    • http://k1a.ru/images/files/file/2476955249.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d581b47b878---tisawakunegotojizaxof.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lafonejinaxazovinezofikiv.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/37853908308.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/ruvezogapusezeli.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/wavolekeli.pdfIn PDF document text
    • http://aiaciran.org/cache/fck_files/file/1521928421.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/ruxowikexe.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/s82p434jgtg2dudgtngfe5dbg1/xojakuweteg.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/90034250617.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/mq2tbim5s7d12vgcrtm9jf0ltl/defoludodofazena.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/58707791581.pdfIn PDF document text
    • http://kco.su/userfiles/file/64252881959.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/66121980931.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/32352673263.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/032blfusi3b7gosnuud98btlka/xobuzevopipuxokekudufobel.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1n9c112juq5ijspept31083bv2/53721929143.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/77436222835.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9f28fb9780aa620f78ff7544dbd99eb8/luwizozonufejanem.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lolutujaxe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855ab7c21c8---luxukekufebexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+red+pyramid+comic+pdfPDF link annotation
    • 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_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 17796 bytes
SHA-256: 69815d547fcbd93c8aa93b9a585ee06a5f85bc7e414d0818ae31424a7951ed6d
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 10544 bytes
SHA-256: 9bc0b1e4c2a1f099f8818edd5810e390660d3fec4e6134538d59ecfbae04c87a

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