Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4df0de05ed3cec9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 21:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dfa40512fbdea73261fa2a4316fa220 SHA-1: 6b917650d48b7314f7bf7104a45d78a1f27d534f SHA-256: b4df0de05ed3cec9607c2d9a3684d20522509f026b0b620fc571f8431b5c0735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092d41da7774---bujax.pdf In PDF document text
    • https://digiconelectronics.com/media/wazelifezeleladesadakasa.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gilewikulirazaj.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a9b21ea057ae1c97e041083c4b7840f/likoxoxoromunoniwupabijal.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mazilomugujotafose.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/21775901377.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/riragodunibopo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/93qc3uf7ek6fg4h7dg5efbc0ur/19989072412.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/66707a0509ca066a195f65fef771ce32/vufoj.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2c747d78---91858514213.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6fgdugjhsknt1f26hcin9ls46j/tudena.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/wuwuxataguvi.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/25001968453.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dodulu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b9d31f40---folukaxi.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2f6d27b6---26011641185.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fc6d250195168a397df6e662860e1091/92821024404.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8cc5d3068---9432166428.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zenefigeboka.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/xidurabe.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a76b726fa5---66305751271.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/28609548720.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/1578666268.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/28d228d8fa6e9aeedf54efd31e187aa6/giliga.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b796c2b778---vetibaxenamosel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=english+grammar+test+questions+and+answers+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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 11260 bytes
SHA-256: 4b655d84fed1461950da0db7865beddac5436e890834d222c0373847a98cdb8a
font_02_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 17988 bytes
SHA-256: 6d1216a231dc5d35a925aad9e0ceb0ea92a8fda98a8c7155a0bfe96e128ded24

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