Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e0a983916c8c9c…

MALICIOUS

PDF

92.7 KB Created: 2021-07-03 17:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b9cd9589dd9b854546009c8f232cedcb SHA-1: 5ebdcf3adb44b9fb71d2da70067ce4513411724d SHA-256: 21e0a983916c8c9c081fb78147ef0e6990fd50b76ca3f2968c9ef05c03aca7d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure itself is designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dde27937---bifabulofozaxan.pdf In PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3b70304fd7878aaca513bacf22178e02/dedum.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/1540562503.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b96dfc696f7---zojinudufoxasaguvoxosula.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5ae96a43f74c2e1ea084c8dbfb11b114/35103048962.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1helqoeebc07k37k4f0sas17am/futegiz.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/94685321814.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0be105bf4ea87b610f0c2791725ea9cd/mokexenitogogerifexuk.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e98a5bc80---difazudom.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/takagumagetalobe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31aec32f5---zosoxunapiguvelux.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a9ccd777---71071361873.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/tezojiwimamoba.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a80b4a71---40841398081.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/m4nu7sj3598kh33f95lqljrl11/56002311750.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6f9813ac---48456041956.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2da7ec34---24626867683.pdfIn PDF document text
    • http://tomorrowhubs.com/upload/users/files/jukurox.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/m2t6soi8mct93r5f8des7uekh6/36179802805.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef3d74ef9---72917569966.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/wakiwafuwuzilipuneso.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a7c97ab6---bezosiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=o2+syrup+dose+for+childPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10712 bytes
SHA-256: de95126259907f37b90e61ba6e3db708cee068ce648d26450a2084b184e3419d
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16760 bytes
SHA-256: 626324d8284cde73470b0fce41c3dfafb7b6bb74449db2d486316cfe5c8a2a03
font_03_sfnt_off00014fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB8 16160 bytes
SHA-256: 61893c6f5a4ed8be90b59e62ba5f7845fe3f782be61d2927f64273611613f2a4

Open this report in the interactive analyzer, or submit your own file for analysis.