Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02c04de8d8c639f…

MALICIOUS

PDF

59.5 KB Created: 2021-06-17 17:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8e620f764a4370f47b3dfa8ed60abdc6 SHA-1: 0509f55629c3d625f1ad8f18a4463aac9479e0ef SHA-256: c02c04de8d8c639f5df6280687467f06bc55cbef1f8bf5fe4304d2be7e093a27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The document body, though heavily obfuscated, contains text related to 'banana dna extraction lab answers', suggesting a lure to trick users into visiting these malicious links. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6609

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://infrive.ru/uplcv?utm_term=banana+dna+extraction+lab+answers PDF link annotation
    • https://medtek.vn/storage/file/gagog.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95383c23c6---11313895365.pdfIn PDF document text
    • http://normel.org/files/upload/file/18429738415.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/5045655237.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pk7bbm71916skbcodojnthv097/51127216972.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/mcmidhk0fvhmab7nlbnq1722dt/zajijilutozumob.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/682542bc9a08926cba755f54840ff4c7/nebimev.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607792d939cb7---84870125679.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/mevegugenafuxemedidab.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a42ac2fb0---gadobazatubu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/73376468740.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f43d063b73b02b0346277dc84439d172/70605934203.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094ec4c73a17---4766140737.pdfIn PDF document text

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