Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef2963a3c85d4a…

MALICIOUS

PDF

125.3 KB Created: 2021-07-01 14:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1dffd4fcff13bc888e77ba7d1d0b96ec SHA-1: cf6aff85a1f67a2cef0aef4216f674573841a1e5 SHA-256: d4ef2963a3c85d4aa19bdcd2b4431d961e34c125b876ffd3c0a13e57bc423d5a
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 multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d32744bbb0a---devemun.pdf In PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/fawimorutaxisutexora.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/50049723207.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9f017b33f470a2902e5c7eb5c629a4d9/zuzaxuvegaronam.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/vvr5r0a8skbc406086k22im2ls/wozajuxelarosumefano.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/eecf9abbaa3fe56c011c93506f11c339/gazufivosaselavuf.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/39603588c258c5b5a434690c4ff67c9b/tewidupukikalunezexu.pdfIn PDF document text
    • http://ndt-ultratech.com/files/xozuwi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/72543886880.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/xuxene.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4fdbe946---sarasezigusev.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/fa6279ec993199cfde2286467417eefc/kitalav.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/merelojivaxirav.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/99120926202.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tuzavege.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e17f09ae7fc429633d560154ffc649b7/47811910082.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/17919e37dc0beb097a5113ec0ca9a5de/34788626165.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/92844952261.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bd185595e98634fccd51af5d3b2bbcb3/danobif.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6825813fc8aeed8025aed77a14113037/46752855670.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/95b16ab7bc38a4170c63cd510b254483/5868651439.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/fdeb589285070787e501a9f825b6c969/37406810492.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dae09d0f5---wefusudafakazo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41dffbe24d---musigoditibunekabalokase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=admissibility+of+evidence+pdfPDF 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_off00018af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AF9 16876 bytes
SHA-256: 0dc7d431a86f6047e98359bbc6e574473e23a9a4a6b1e3ca4fc593f18ca1be54
font_01_sfnt_off0001b6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF07 10820 bytes
SHA-256: 31b36fb88e01f7b3427dd5b3b47d990523c39afbd19f080f82f8def034e55e88

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