Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6369e60d8c3728b…

MALICIOUS

PDF

78.5 KB Created: 2021-06-20 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b6e5ad1cd432471d088411e63b78bf9 SHA-1: 50c6284e9514953cfbaac1e99e69ca143479344b SHA-256: c6369e60d8c3728bde73eb6095056b4caa4a95d7f3476c793802f3f81ba7365d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to websites hosted on compromised CMS uploads or disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://geose.ru/userfiles/file/libajoroguxa.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbc938edf---97537242146.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cc5dc22839000534720f1de4eb93e27d/42007716200.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2k2bhj1gleqfi0mp9pjh0vkqg3/18250584918.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798e1506ba9---49697162513.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/tevotanelajefubipo.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/35d605839d7d531ae14be1899d353646/lududomerasopabujalot.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794bde6799a---devivanovigi.pdf
    • https://alirezamirmohammadi.com/images/upload/files/kilarasebanopivizogem.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/228265b653b9f26fc904fd3fde092730/34975886624.pdf
    • http://alexhoffordphotography.com/temp/files/file/riwelolizutulidu.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa699a7af59---48666756169.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a79f12991d---wajizufovajaxadu.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ddd18e1c---kewafi.pdf
    • http://hncastlecable.com/d/files/10076448314.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160759d54edfe1---tejuner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fruits+of+the+poisonous+tree+doctrine
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f823.bin
3057627aca550316f36ec4a3e4ab877e4768e4c8ae10b260badcb6af675dc0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 4956 bytes
font_01_sfnt_off00010903.bin
d1563145c466153009c3eba126b711c6d9358db7ce0e930ca807db84128c93e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 10636 bytes

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