Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af04542a8d34f28…

MALICIOUS

PDF

109.5 KB Created: 2021-10-14 13:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-06
MD5: b030a61058210a6b1245639ef317be6f SHA-1: c4ff8da8eb17de3e98cd6588e460e862d9b565ee SHA-256: 4af04542a8d34f28303d5d42062efde90e70a985687998fc6e42ffee8b72eb6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=meaning+of+humble+in+tamil PDF link annotation
    • http://fgosvo.ru/files/files/zedatikufuvajewurereboned.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/35532409268.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/fapuwotolidefegobusakog.pdfIn PDF document text
    • http://yongqingtech.com/d/files/65844740108.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/82306030279.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/livigosejatebopimusa.pdfIn PDF document text
    • http://muszempilla.com/files/file/vuvinurotaminaminegufur.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/56608480923.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/kojokimipeje.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nujibegebuvajetejifus.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nezodegisalovub.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/8397583376.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/62984269397.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202110112151221972.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615392bc470a9---zumevugifonij.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4557971d9---39223933583.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/91153111605.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wedazadu.pdfIn PDF document text
    • https://resicolor.com/upload/files/dexovevifibu.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/bonovetilitufuji.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167da43a0763---35610260896.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/93605123471.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/53352784363.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16161b0502131f---vigerikovo.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/miwubuxufuwutajuf.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_off00013e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 22496 bytes
SHA-256: 0003418eb796be6f0d344cbc47cafdc28a9fd2166078adb6c1e76aec4a3a3531
font_01_sfnt_off00017818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17818 10628 bytes
SHA-256: e69369b4d21832ba7889462062c15d08fdc268909ff4cdb4d69959c4786f1d42
font_02_sfnt_off00019026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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