Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f3c419bbd420d3…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 18:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aac48fb68f7f53bdda597103cd637cb5 SHA-1: 6fbb1837be5571f6d25bc3cb030a39ca9130da6c SHA-256: 64f3c419bbd420d3e254bd3eca2ee9cf81852df925265b89afeb678947a9521e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised websites suggests an attempt to redirect users or host malicious content. The SE_CALLBACK_LURE heuristic specifically points to a social engineering tactic involving phone calls for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://zamokugrofa.sk/admin/fckeditor/file/55133633648.pdf In PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/94171608097.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/losamurizu.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kerom.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ussmb07jbiuqipat833t3p80e1/9551908004.pdfIn PDF document text
    • https://sfilatinogourmet.it/file/nojupogifomaxidapivuduki.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/tezupuvomug.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29f115eca83afcb234b433c80171801b/wezefarodivakuxobu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86933a9bc4---rebinomudusapa.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/93a651a58ebe4ea4e427d7ca3c5436fe/vosut.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202108110309064785.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/27625988160.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0003177001625155107.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf026c5e2123d6d89a4128d1140b7a66/zezepawogamuzuzirisizuv.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/vetajopon.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/42196441344.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ca457dc23da083c3b4e7a6795142d678/dojupusijegejozikivulu.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/pafiwapabar.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b71649ec---69222818117.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/73903177795.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/60003217964.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f41c3490ebb1993172808f1a200bf2cc/jekesuwirixogo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c805fen2cpumggr1g1djjs4gle/duvaduxibagazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2017+chevy+impala+lt+owners+manualPDF 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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 17552 bytes
SHA-256: 03e04cf71f22a82010c479f2189f915228296e24c1ddadd63ff2b24936518176
font_01_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 11252 bytes
SHA-256: 702d24d9d3f411941ba59925147aaadf98be0b17f049cd926108e724c97d9f60
font_02_sfnt_off00013af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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