Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6ce4edc7d8ae24…

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 16:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba9d7b7cc59ae88ff4b407138aca972d SHA-1: 91959fa9159a238f528455eda3cfece38c6ace3c SHA-256: 2d6ce4edc7d8ae247b742fc07f07d7094b6a068d5f7a427543b6468cd685400f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://beloezoloto.ru/userfiles/file/lexuguti.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5nv6blr3r028dcshdjgul6e19l/vawejavisepop.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/vinpna2assk1cb73sdghcgvaiq/vagipenojegofiregi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/373b5803195652d90496617479da0e2f/xegasoperatoxipo.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3ac9cbb5518072540c1cb2735efc053/32431769330.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e943a7a41709410268be7b2dbfc5f14b/1708774543.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/73197437538.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kixujupukarili.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/gumajudolerewozegu.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/vogenuludadapapobumef.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c817a066---90182996823.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a04b87798---41926909678.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/bolefi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52db13603---xobegajexepujogaka.pdfIn PDF document text
    • http://paliukenas.lt/i/File/96839991311.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/91394479091.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcdfc7e52---kipokarokuwew.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1cdc48ef84251168cb4e50794a592b80/nafet.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d816bda175ee19a7a6799d40275a2db3/9489693148.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bb883cd0---83029555235.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f6b52ef12---8701151607.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/61718366790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what%27s+in+the+codex+gigasPDF 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_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 18444 bytes
SHA-256: 00538a0e452ed7b505d71c0e3285e58734a9801f163be876c2ed31801d625ada
font_02_sfnt_off00013d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5C 10632 bytes
SHA-256: b4451a5820428077c05844fae8e21b00d291b07cda942f17f802c6b5b7b3a36c