Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9bac0bedece0d1…

MALICIOUS

PDF

83.0 KB Created: 2021-07-04 00:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4fe5331e8ccbb14261c6051326cfd501 SHA-1: 59a0bcb89a00b18409fe5d294ffec2602fcefe90 SHA-256: 3b9bac0bedece0d1f8fea446d07a4338f04b4bf3b085207d34b69cf519821eb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://infrive.ru/uplcv?utm_term=page+life+cycle+in+c%23 PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1901921659---95551192921.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608714b6b90d3---nofitowapiluka.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/88f5c7cc627a071e241fb4927a0f3299/xutosajor.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc2e4bfda---mufasojisodotapijijas.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a5c5e827e.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/02399385a79a351eed3ef2e2d0d5df40/45013204053.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d031f793b3---wudot.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/zewudeterapusi.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vepimanor.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c38f25f543f66400d6597835a4263c39/zubufovesemubunaje.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kupexajibevawuke.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/255b0030efd069b1180547d62290e414/5666716767.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085f35e92091---xutemokoreze.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/440d63cb944e0091fec93e7fb99f67b7/72650152879.pdfIn PDF document text
    • http://flirdining.com/uploads/files/kipesewuvuwovipugaregu.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/37491078388.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/wabigatemakudofifumekazo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/4237666248.pdfIn PDF document text
    • https://mfdesign.hu/files/file/79812223704.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abeecab171a---peritobubepuwofixajijut.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/zatizizubusedajajuwepi.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 17440 bytes
SHA-256: 87f8aaf2f50aea589b500ecf7b1d0c6804dcd9e3102bb5b1c61a6b8b2baf85f0
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 10140 bytes
SHA-256: cdac8a00a0a6e2c9426ca1f766d6c6a79158441cf57ab0f939d2bf62080f14aa

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