Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf64d6354673c973…

MALICIOUS

PDF

108.3 KB Created: 2021-08-01 20:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: be4ae9c36dc9ff6c9dadd21ccc3e6fcd SHA-1: a956f6fc221ccf7787755a59db31c4048f66cf32 SHA-256: cf64d6354673c973ab0927d480ab4a756561d6f06bd4fa3b7ed72194437d1728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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=what+games+are+compatible+with+thrustmaster+t80 PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e1e4e615---8871167433.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xapudaxukiremonudu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/jeverisutefa.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/18349808188.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/dujinegakugopidumopu.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/63630899294.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c9fe2459---86365692176.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/fanadilebeg.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b8590902f46d645194fe8e0cc06e2616/vojajin.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/puvotapujopelapilipewuxi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7c65d137aca120c2f6b7845bdf3158f/tovulakizajuluna.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c81653c2cccd590064230605fd8a212f/34745522838.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/auka5251v69rjqf4lvfhoorr01/sunaxunedapo.pdfIn PDF document text
    • https://blokhol.com/upload/files/godopopigama.pdfIn PDF document text
    • https://belloverde.net/emailer/file/winuvirigeze.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dosurogajuvokega.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9deef8e27dc64ad74e38db5ec9e603a9/gutolebumomumotewujig.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/fuduvuzakolajalo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160793d4056b3f---33272463801.pdfIn PDF document text
    • https://biocoils.com/img/file/kunare.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/jokezawabav.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/o5qsvebcvlproa6bs1hgdbhc66/47512109643.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9e160d47778f8b5cbcb2d5bdb91524e2/1916626545.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb791f7d366---miginorusovajupirena.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/kedaxareromesogaro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 21084 bytes
SHA-256: ae2de08b100c2f901e5829d06bfd91f4717fbca7fa92822cf09e12a71d51b880
font_02_sfnt_off00017024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17024 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35
font_03_sfnt_off000187e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E4 11364 bytes
SHA-256: f6f163cfae0f3d3b2254032151b84369f1c53896726f57fa7d9b247a957e68f2

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