Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0755d79a8c52139…

MALICIOUS

PDF

40.0 KB Created: 2021-06-26 16:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5ffdf206a6c0dd74210b73f9fb447c8 SHA-1: febd4a603ffa10eaf0824f6d7262dbcf5a824994 SHA-256: e0755d79a8c52139c444c7402455e31f1975bc5a5e24c6156446e92e9c81c54f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and a machine learning classifier. Heuristics indicate it's an image-only PDF designed as a lure, containing numerous links to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8821

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
  • 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 40 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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6c6cbfb68c41091823f64af4567ac896/nafarerugokegozesozobete.pdf In PDF document text
    • http://cnc-soustruzeni.cz/files/file/57019709028.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b2cc3b3809edc3eef07da80a4191fcb6/15611198099.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d2dbbc366a843f82d25d457e1c866e53/jopowufizetow.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/45476409806.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zupel.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/ridakakesumenasiravuf.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d594504de---82066670416.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75036e7a30---tafinusir.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17692dca5f---texizidoko.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sv814pi1ip8id6mhk16s1c754r/visopulikimepanaseni.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a63d0a0e9a2e751cc37b9c9ac9653ce/92351443427.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3086e9b9---78489172058.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c661d4f85eb585e167e98d020a91641/9592081165.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sagudajexevidig.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/futasidivijileposuwo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607677ca6b1dd---firafidekinisol.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ae04773cea1680b1729b13db4301b300/95648128263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=for+an+extrinsic+semiconductor+the+valence+of+the+donor+impurity+isPDF link annotation

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