Malicious PDF — malware analysis report

Static analysis result for SHA-256 870dfbe71567baad…

MALICIOUS

PDF

61.4 KB Created: 2021-09-05 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd10c132ae70a34dc859a298c5654347 SHA-1: 50ff4e6058f3cabd4b4f659b6b320dd10ce7be33 SHA-256: 870dfbe71567baad6e2cc70090ff13514ebda43f3728e219baf65fa378f59b89
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5895

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 http://wellnesszeewolde.nl/site/data/ws/files/tigepopexuzugusufoned.pdf In PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/zakoxonavikurowetobakures.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/un5sjl867oscijoq0u52bm088a/10666368106.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/43229567466.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0d4c180048af0b5a74b33d69c6ad988c/62077769614.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c47ac4e92---vesajutemofuzaxo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403cc8ace---supepazel.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/67552497193.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46419806139.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/sajizowafojofelavig.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/mojigitenixob.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/lusinop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcede31ca8---93097922214.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f6dc0f5c---7968217840.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a016e33bf---97878001776.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/68214570743.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e083e35f---zelar.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b1c2d6c753ebda11877e5dae4037f026/73769861021.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/kitifelu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31cef9c4bb---94191428975.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d74a2178---zeradetoti.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/82681242388.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4818b4663192dc050e1ed8601a951951/valiwefipevoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=extending+sentences+worksheet+ks2PDF link annotation

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