Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eb5211d797037b…

MALICIOUS

PDF

77.4 KB Created: 2021-06-15 19:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c42317e4846184a050ce5e456719753 SHA-1: 5899b7d1fbed2c00a3df9b403d43fd6fca7ee9b8 SHA-256: 66eb5211d797037ba03b31f0cb9a9379c8f82db33bc669114d8c64fdb85c2d0c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=bahubali+dheevara+ringtone
    • https://afayl.com/userfiles/file/4177924183.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f114518629---lelukenipawaju.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a5c1539e---29788226746.pdf
    • https://acronimocostanzo.com/userfiles/file/78381560657.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/xututekedunujusaket.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00bb267ae---jifamumegukebov.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606eefb3dd80b---30319436965.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9s7qlft0bkuhrc6q715lml39q4/befexut.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076138b7112d---sadezirusuwekanif.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/34008790391.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b771d368e0294f7b67c6247190de271c/89521944914.pdf
    • https://tese.in/ckfinder/userfiles/files/49072012371.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078381ec471b---zalaga.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088815fe6ead---zedawazaxar.pdf
    • https://fanaf.comarticle_ressources/file/13443937227.pdf
    • http://immopolignano.lu/images/21863271888.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kgo6b0cov0nueliq1ti50dnf81/difewaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a0.bin
56ea865abae2985175deac61b5e83e8923dad26cce9030773e01dbc29b283efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5160 bytes
font_01_sfnt_off0001042a.bin
f53633965451ff7436ee7dfaa572db833ec994d0233a4db9175b6c62b1808734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10868 bytes

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