Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec310b6f2661fe24…

MALICIOUS

PDF

108.5 KB Created: 2021-06-29 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7671d8b610c4804b2737670b9dbfe29f SHA-1: 2aec42ccc36773829c3c40a801303a1235e7cd2f SHA-256: ec310b6f2661fe24569a0cfe80388fd13b694d4705f7eda067ad5090d61cdaf7
156 Risk Score

Malware Insights

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

The 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 distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9aef5b63f---78482665317.pdf In PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/bumovaxopipikokulojuzukev.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/93440596203.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608663b83aebe---85952388840.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bda4b2bd---noguxa.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f50eee5583c1507a7f91b02c94666f6f/doraxelutakikobufapolox.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fa78c171a7564caf70b90c20e37bf8ed/pisedoresikataw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ggr4jcssrd6asgc9cnh3t3mah1/wokaram.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073c5b7d15---27402451087.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87153da40---robowomevanovipagum.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h1be00ueg4h28dvas9jp4d05ee/zaxujudevupitorarizivigi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8e30d9f5edfa02c16e3f230687e20f33/vobamozudiwekiraxisajiso.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/o2e5t4llpt4pvncbhec089bfp6/pomelesakupimumir.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/600f90cdead720c243c2f7bbce9c04f4/24739632368.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459cc6b91b---78226231884.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/vesig.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/65910108694.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/37866573042.pdfIn PDF document text
    • http://mopron.ru/upload/files/95652685679.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/22297122297.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lijenumix.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9d9905e93497ee619041d20f48302316/1037409226.pdfIn PDF document text
    • https://buka.ru/sadm_files/22250509805.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wopuwodeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=overwatch+recoil+recovery+aim+compensationPDF 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_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 10928 bytes
SHA-256: 9f76626bd030a217f929b03db635753d4a2d15fc63a4f385b957d2a5290c5485
font_01_sfnt_off00014510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14510 18356 bytes
SHA-256: 8277eebd761d33b52b7c690efe05d3d1796421d7bce26837e37af9d664bcf425
font_02_sfnt_off00017517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D28 16536 bytes
SHA-256: 6de3902c7461a3145d360c47726d372827fa5621801b216ea778d840d327ac43

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