Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be3b4b66cc3831c…

MALICIOUS

PDF

65.2 KB Created: 2021-05-28 05:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09427faf9d7faa6456800b7a559ce2bf SHA-1: 0f5731817a93d2459b2974d957f06efc2040a670 SHA-256: 0be3b4b66cc3831c39b5891fe603f4b09b3a610fab65bb470f4cdb49784d72df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to potentially compromised websites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware or facilitating phishing attacks. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://anthonygillant.com/userfiles/file/xeferovafonova.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/82378aa6f97c7c7766d42e14c366e7cf/25867605828.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e0e2b7e9---gozabelapek.pdf
    • http://richmediahouse.com/admin/uploads/file/juvim.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75e40a8ce---miwireviraxuwud.pdf
    • http://zaun-produzent.de/userfiles/file/16193390946.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcafa69da5---8495509343.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160953c5c5d506---loxosutejufu.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4228af67---tobijanulalame.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/facd580a8c14827f9f48397353420655/57229193518.pdf
    • http://a-swiss.com/upload/userfiles/file/80320446078.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0312601802---gukusujofarodu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f201959db0---fesudapawupuragi.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jukf2uc016lbsairovai61a8t3/zobum.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1c4c7fb4---51091990.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097321d9caab---44716558882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=red+lobster+lunch+menu+macon+ga
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d9.bin
bb303824efc9630039a6a8abd94d38035e24550db67d6a6fa6b4a173fee878dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 5500 bytes
font_01_sfnt_off0000e85b.bin
01768e61d1d34065ad72c903134eea3f207fdf4edfb050736e5def555f28bb20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 10340 bytes

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