Malicious PDF — malware analysis report

Static analysis result for SHA-256 121d1ee88289ab8f…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 07:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1c937d9b82bb750a85ee1bf673dd9ddc SHA-1: d8227050e1c23e2bbba0e9eeb71161c6d482d208 SHA-256: 121d1ee88289ab8f4c73064c24957cc9964f05827115fd041059042f65275be5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage distribution or phishing campaign. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=every+other+cell+color+excel PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/aad3368b06410d0f1820c9061653dc77/20696739661.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3d42b4a05e6cdb87ecce269358897599/nalosa.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/q19kjc28f0b1jl892i5m1jg4jb/riterixejugizom.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da48a6693---felun.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8d865225---13764628309.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/59014148526.pdfIn PDF document text
    • http://www.emailposte.com/pictures/99273873861.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/csiegj15tbjh5v167i0b2hgt7u/nusumobukerebefogotatup.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/8093462759.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1feece989c---45366582207.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/91630234179.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078819b1f558---21434245482.pdfIn PDF document text
    • https://ka-base.no/images_content/file/53250137286.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fb1c5b9cd9dcb605a7e819c901742a9b/nebatululizi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071342724027---32345779261.pdfIn PDF document text
    • http://goldmustang.ru/files/files/kegobanedosadi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a7777a2eba2b647d36a9fd22fa3d5d94/79059773150.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7255eda3184f369e6db533366c153ef4/34592589199.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ddbc85e6ab8b218f857aaf8ea0276391/vebarekamusonifus.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/fodorepekenisovudaj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789d1f69474---fowogegosorisaxaxaloful.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad59f8ace7---kogudijavudunojudijineze.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa02ee279---gogolajukodunosewatef.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/88b770cdf3bf58fbe31316ef783a90f2/8746255259.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 17400 bytes
SHA-256: a3f4fe0d400ca9a5c9bb6beff2c970d2dbab2e3cea78aa8a044c184d3f7124bd
font_02_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 10064 bytes
SHA-256: 2137204aa506a18826f96ae89cbad27b2b661460d59870acb1ea022f11225aa1

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