Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b31a81188cdc8e0…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 04:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: af498fdb98643caff990e8f1765bb852 SHA-1: 46d5101e42ba5b352e923cb7a3f0e985730b2e86 SHA-256: 9b31a81188cdc8e0ce80fcd1518c7b93486fb9b956365bc741ca243976f2d9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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 http://parentini.it/userfiles/files/nutojomagabejuf.pdf In PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607881e8bfcaa---20133274966.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/muvuvibibipukumides.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/95bc0373a0e6b5df6336f8408f4c65d5/94981217668.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/86083031074.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6869a948e5efac23baafe7da582babbd/63503737349.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/ruzugod.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94a0de1b3---92785590394.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086a805c6c2b---49261977546.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/nefawikatiwanoranakag.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/62e7a227640399d0e04e75d1e95e0dc0/mijugul.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/h2ou97pg9on2v8l2ht1qsqhvvj/xixed.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/81100637325.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/muraxepemimorawovipi.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062618443473.pdfIn PDF document text
    • http://acrgroup.nl/userfiles/file/21264820666.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/5487972519.pdfIn PDF document text
    • https://dm288.com/slicice/file/11566183669.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36171350464.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/31cccab746585d1b43efcf400d1f04e9/putinerumavana.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb37dd36e85---57536245105.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/165644864790e157692a56e63ffa9106/14541427871.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7ccbdb2f---kulita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=intercarpal+joint+movementPDF 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_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 10516 bytes
SHA-256: 1ffbf7c4f11fdc674096e780905a545f307d2434589e1fc85571e65969e09c27
font_01_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 17440 bytes
SHA-256: 0e8a7e65bd53a8c93438ee7775eaef76852aabf7f8b763d889bb86b6cd32d243
font_02_sfnt_off000158b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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