Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeba8a0014ed226…

MALICIOUS

PDF

44.2 KB Created: 2021-07-13 00:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e06a0a38d3c866752e1755d0fb42e207 SHA-1: f84586193b5983dd5329fe064a686c689660d278 SHA-256: efeba8a0014ed226060140dea3893defd21ddda0ae9dcf7dafb64cbc1f1b4566
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to multiple compromised WordPress sites. These links are designed to trick users into downloading further malicious content, likely other PDFs or executables. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7152

Heuristics 5

  • 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 https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f0042aac---21932488626.pdf In PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be17b2a46---29881094421.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac830aa2a87---nexomeka.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc38d0e3a3---98327127630.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/90661859557.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c962389537---zaxop.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1715e382d5e50c1c70175e3641c68f1e/narezijubelog.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/popoju.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb53425d91---vijunegivibu.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/pejofumepukekuraravevizo.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kedatexikerib.pdfIn PDF document text
    • http://rayanchem.com/d/files/fuzutivogofidanofozupati.pdfIn PDF document text
    • https://istanajp.com/contents//files/duviretilatefanasiw.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/55558639965.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/89ce3789c89edcb6dd8c30b1b29a42cf/piwatuneb.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b18efef0ad---poverijupofudajawijonewo.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/nukeboxotesame.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/68859409002.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013f75752e---42921676890.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/egb1vgfd4g06d4v439n6uhcu57/99268695529.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/95145979264.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wevumifuzasogofawe.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/poruwenavuzoxi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/35069903752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=c4+grand+picasso+manual+downloadPDF link annotation

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