Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a8eaa99f7b206c…

MALICIOUS

PDF

48.4 KB Created: 2021-08-15 05:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b36a8dffa41d6429181829faee28a8c7 SHA-1: 425bd9a2c851d8a7cd9ddf6812614a015d196ba4 SHA-256: 08a8eaa99f7b206c720b80a2f04e9a352f501321624eabafd5956583a1b9b7d7
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8648

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 https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e81a05f55---4820020582.pdf In PDF document text
    • https://namlongadc.vn/uploads/news/files/94479895103.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c233dbb1eb0---numamonoxifizitefubafa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f146b68cb---fexadalobuvosavodatitoza.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/94389902976.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/94516935984.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ba4da73a---13380708058.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/64447623913.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/tazonuxuxuzivebeleko.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f942bce28d12df42e58702853b1a8856/pupuxopujomojeborasamaxom.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/29273629699.pdfIn PDF document text
    • https://dcimx.com/files/29452641217.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ecpccs8iupkrct66bbdv9b8g4/61033441897.pdfIn PDF document text
    • https://visualarchive.bg/files/19385118282.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/81916787826.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/57258426649.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/781ab10f5361974925eb59dce7c8637f/57596103725.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b7ffbb9f1---damumasobixupoxudaxel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=grade+10+12+biology+textbook+pdf+zambiaPDF link annotation

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