Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0539efd99d105…

MALICIOUS

PDF

75.2 KB Created: 2021-10-07 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: 9d3e19b78d0e99fff4f4be408943d1f0 SHA-1: 3c5889d5c723af567b0cefe6db4a127edf13b2ad SHA-256: 4af0539efd99d105abf426a2d6d4bf5de5812c807f8942264cb06d0e08061e92
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=slenderness+ratio+meaning PDF link annotation
    • https://asiquim.com/ckfinder/userfiles/files/29442229447.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/nefekinare.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed361c1eb---84373452575.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/84637788088.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vuvafusenasibewoxatenufi.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/77342370140.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/robur.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/89533003817.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/14721473837.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fsrelsq2bbq0ajq4icq45anmot/16562290490.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/fetuviga.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/93618662125.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/77850988214.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090945457647.pdfIn PDF document text
    • https://hobbypet.cz/files/file/sinebe.pdfIn PDF document text
    • https://citytrafik.nu/images/file/74949138802.pdfIn PDF document text
    • http://dubiliergarten.de/uploads/files/27650108375.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/masaze.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/61741324231.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41136dd0b---70919253901.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/17114356745.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/tefigulewik.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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 18564 bytes
SHA-256: 8f2bad9dda008e3b813d214ba79278b8991ddc287e667365c16c90c4214af68c
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 10664 bytes
SHA-256: 34c820092c0044aea1e81355d9e9605fa32271d85cb0baf92b015512cfc349b1