Malicious PDF — malware analysis report

Static analysis result for SHA-256 5596f57ab5ba20c8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 20:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ceadb9e8e56b82c3037b60a4a909139 SHA-1: 621decf70bcb22c63c45233b3ae3839b0ccf5da2 SHA-256: 5596f57ab5ba20c81a9eaed5c8f72fb3f9116f403f93e8d64536aeaf6f033f86
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=cleo+gold+app PDF link annotation
    • https://vnycc.com/userfiles/file/xegolekevol.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/mokomodibubikawijodepafok.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/50752176484.pdfIn PDF document text
    • http://wirheiraten.de/images/file/5830356790.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/fuzekuk.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/xonewako.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kt0v9jk5tk9e2p7futujoclh0j/9782125816.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/sobugipanogajovixo.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/13392894528.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/21781203796.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/zozixujalo.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/turoti.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/36539763647.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/17323838151.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/74848618174.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613073b93bd09---kutine.pdfIn PDF document text
    • http://surausa.com/uploads/files/nekobo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a74798215fd0ee3a27a79864c73c0882/norodufo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/18318301221.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/zawapixefidexavujid.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d60528e517794d4175b70aaf5d71f242/86404544813.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/naqbfc99v8nmvm3lgk61ngc5v4/28500924960.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/majoj.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/mipap.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f2b779e516d1885a9acf66dc444deef6/891907512.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_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 10036 bytes
SHA-256: 5440c8be5f1df808ffe9d4b7b368f33bb35afc2f60db6e7a8b3a831ca4a5fd78
font_01_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 17044 bytes
SHA-256: 23fe322f5b75ac0d2ac498b61f4f8b95119b9f836d59989d8adc4c95e34d0dd7
font_02_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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