Malicious PDF — malware analysis report

Static analysis result for SHA-256 397a738c6f3dfa46…

MALICIOUS

PDF

42.0 KB Created: 2021-05-15 11:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2884365b041e507aa357ed7ba365fc58 SHA-1: f4210f1740cc740f58be2cab8b5cd19d0772b1d6 SHA-256: 397a738c6f3dfa46b415769e06fdf2b7f1a49653a28e48c5a25fed1e64013c25
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and a machine learning classifier. It functions as a phishing lure, presenting a screenshot to entice users to click on embedded links. These links, such as 'https://coretry.ru/uplcv?utm_term=florida+learners+permit+book+pdf', are hosted on compromised CMS upload directories and disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7871

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=florida+learners+permit+book+pdf PDF link annotation
    • http://www.celso.org/download/63641011904.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/881eaddc6b574fa71bfe783a16f329cc/saxasiruwilitunineko.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/05982925e23736ae9760da9a6f2908a4/15827737339.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/cnkuk6qb4180cr0mie8n6d9d28/3628612539.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbac2466f---71511652509.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a54e7ee7ab949e738960410d9962da6d/5631163507.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc63ebddb1---lagejupitofogepidafiw.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/13e494c92087d488dca7aa32de38ec12/20115486663.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/bc07135a1c42202be2a79c0b359312ae/wofedexebamuzozezogis.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdvvqku8qpaos1okmfncgp9642/tiriwukeferalopojogedogen.pdfIn PDF document text
    • http://yilip.net/userData/board/file/situvewofazidutuvegidu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5639e16180e18507f779bf6cf8a2cf23/molevupupaj.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e88fe1f0af39971644d9a73d91069cdc/12150332844.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/5s6438if0kv3pmj3fl3ntrok96/bevetodexalame.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb640f661---xaxopep.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/55558639965.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0179acc9226652a3868ab5f55e506b73/93731824489.pdfIn PDF document text

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