Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ad55fd73f1b98…

MALICIOUS

PDF

57.1 KB Created: 2021-06-21 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01318dca5a755d4d2c79d3ebf0d9faf0 SHA-1: 6729693c25a1c962b5917bc9d0cb3fec3cd29196 SHA-256: bc4ad55fd73f1b983460e7cca7e70a53fb19f0bbf117260f1baac020a8e24c23
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to torrents and application versions, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8925

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e53015dbd2c25182b50944f0dda331e7/muwasakifolunatakegejivu.pdf
    • https://littlelightnepal.org/userfiles/file/xibawofukazosekirigal.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8c60b7ea---17729838117.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/210a6939f32bac6747745a2d211da56b/nusanapuwulira.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1d941128494ac6af4d8f9c2ca1fe93e3/26300520529.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-13/20210513132144417520.pdf
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/84035487695.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7044386a97127625404aad2a9fade57b/gokilunaxigebetixegenofo.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8537a46c9---pojobuli.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd1814b924---25819726988.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f98722c8---36805977831.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/800aa98d58145f4ae8cae826bcac3cfe/rerugufosezifip.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89494a546c---silidobunizepenometobo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=yts+tv+series+torrent
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66e.bin
4846888acc8bb503ec7fc85f34167dc70258f66f5a1b8e6ca7f3e04aacce8e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 4456 bytes

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