Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3211c1dbb686d0c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 21:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2989af535ca44fd783a11ef25e7c726a SHA-1: 3528ec61545216c20f1ebcf4f06efa0b424819cf SHA-256: c3211c1dbb686d0c82a34bf3dcbc6ad464dfad15cc678388928d0dfcab7c1c1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV both strongly indicate this PDF is malicious. It functions as a link farm, directing users to multiple unknown or potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of numerous links on disposable or compromised hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://unseenadventure.com/userfiles/file/piladunuvigudu.pdf In PDF document text
    • http://celcg.pl/uploaded/file/mokux.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b9777d94d---wekiwenosotoxe.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/59b3010ea9b0bef014e5ad936eb4842d/bowemiterakonogexez.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/61442286842.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/15r5hth5c0p315gdt500im7nu1/dafomusixudigapifoti.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/91075667507.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/8802320967.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sexeji.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/vesopibunezibuli.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/zakix.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a710b975453---25074792100.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/37265542876.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/dibifowunup.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/85369243966.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fio36uhbbj453o34r8mkbfdj2a/rafajunugilaginonoka.pdfIn PDF document text
    • https://aashianarealty.com/file/99023429213.pdfIn PDF document text
    • http://atomleasing.ru/media/File/24626601944.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/28666768609.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/vigabuv.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ihj9avbongrh2om732jllabi22/78300853636.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/kebenirepiwabuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=shimano+claris+derailleur+manualPDF 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_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 16916 bytes
SHA-256: c3bac1740001ea0c338efeaf362d3c3ebb459696509cbf38691016ce58c6a273
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 10712 bytes
SHA-256: 6cddc34f5aefeff9916993c31af8340a2a03d13072b04cc7379e5191142763b9
font_02_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1