Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5052846a2ec2f7…

MALICIOUS

PDF

61.1 KB Created: 2021-05-26 07:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19426a273d5efbda5b087409d90c671a SHA-1: 8ad556a9b9ab88ba49f8c8113f7924f78e917d28 SHA-256: 4d5052846a2ec2f76cd1ef0ac20a1a332301b71201c17c34d099a847c0342c16
154 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=powerpoint+countdown+timer+template+ppt
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4195423e7---rekegilogisugiku.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9921188826a93360e4f9ea3b75d0e394/62819197718.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a1430fa5cf6a57304c909c769efe09ee/vikobiguwatule.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b91ecb0d---garujemu.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0a466db1---85097223280.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c5647685---pebibesewanugapidugut.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ec6d05fd---sisalawajetowizezezezube.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39b8fb4b3c3d328b16230aa15ca862d3/79258796222.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f105a452---42388136765.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076f524ce83a---51620697959.pdf
    • https://ideylia.fr/uploads/file/vudazuxomevazepokukada.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75430931282.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rdfe3ip3ak05ka8gqvioq918l4/24521284879.pdf
    • http://imaginove.eu/data/Files/77078556503.pdf
    • http://kibbkw.com/uploads/file/5272680545.pdf
    • http://dynamic1984.com/user_file/file/32956049485.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d751.bin
f4a7ecd99d21ac95271f61586fe868880d6ff4ed34b2c0fe30532cade807c377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 5136 bytes

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