Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4f2df54e7db4ce…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 04:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e521376c946670389ce8b17663b11024 SHA-1: f7e0a29f3c5e8401681c775b222f1dc09c236ffd SHA-256: 3d4f2df54e7db4ce5b5bfc1493f8b84093d9d13655a71617bdebea16a3d4982e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting and a URL with a UTM term redirector further supports this assessment.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=seeley%27s+anatomy+and+physiology+11th+edition+lab+manual+pdf PDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818bbb2dc9b---29863534277.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b60eb3604ec1b36143e1aa5f71e58f7/tamepu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5935b232---wiripuvarija.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ba230383f71758970e963132d6b161f6/28592699253.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d68c9e02241626d784e8b77c77cf9ec/4364495673.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/51927517686.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gh67ud1i99llj4bj7geqd8n66r/pufugimabitowokazuzezek.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/ruselubu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7c0e0b7e17f1ec86dfb5c4bfca4181e7/tolujukejap.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/sudomumoxibudaxifujo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c74739e6f81---67281294372.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/runozakimalade.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/jusiwijowazugegawen.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161158855903f9---62300038127.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fulalobuzagipinijel.pdfIn PDF document text
    • http://fxlcd.com/upload/file/57337138735.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/79242752490.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709072f4144---sosivigisoxifaridep.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/48220688385.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zupenominevu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/19494403246.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/75337536379.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d0792441---67585839114.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a724d8b39---navolemilupo.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/61165853664.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_off0000b958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB958 16704 bytes
SHA-256: e96c5282d7e3b4e4ffdd390d1e9c53a15a999a81768e2cad42cae355255b48b1
font_01_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 11360 bytes
SHA-256: 1d71ec73c662ebac4ceca762f68539ab71798905c0f11465d6e9496e2d5f6d8f

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