Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41f5def416b2bff…

MALICIOUS

PDF

59.9 KB Created: 2021-05-15 23:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f9b7176a49ed6685010ef187bfd1f3 SHA-1: 5806c672859a62b950791f0ff22a7f61e3d01e41 SHA-256: e41f5def416b2bffb2ab78083f75803fc8bb9782672b6f40f783fcc25fb9ecf5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://alarcon-v.com/editor_upload_image/file/97285344415.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbffdc5c3---86739057534.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fuj50pv6q8fqstqkqui83inlb/77310313237.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9a6f6c28fa7580b4fae8f55541c6783f/20846067800.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c57d270fd---wodonevenurofaj.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160946b5171311---viwagegopimep.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eqfpebmlqqitfpf1tvpo3mm0k7/78309942817.pdf
    • https://agrimal.pl/userfiles/file/92255711013.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/615c2a179883e2e68fa17f99a1fe863d/99815197450.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/1hvc76g0l55r4n9mdasnkikekj/rubovewajafolevuzira.pdf
    • http://akcjonariusz.com/UserFiles/file/miwufazedelidokal.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5f7571fc915a623cd6f6caaf91adae94/mevudetafekolaraxufugeg.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160954e26dc830---18497643676.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9urofee0ra46g7s4mn923a6ill/jawuwojosuvutorevawonuzu.pdf
    • http://aliceinformaticasrl.com/user/pages/41523059280.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=toefl+speaking+practice+test+with+answers+2018

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