Malicious PDF — malware analysis report

Static analysis result for SHA-256 294a190a1c3a582d…

MALICIOUS

PDF

79.7 KB Created: 2021-05-09 02:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d83e27947374eb5ecf582238178035 SHA-1: e7912585c48b08501e626b4ef4054a95468469c3 SHA-256: 294a190a1c3a582daedf38b5accbc99148357d6e33aeb9c958981ddcd16e08cc
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. While no scripts were explicitly extracted, the structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee6c11158---37011158374.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608de892cc882---netagofubibixaw.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608556cf2a78a---34811694516.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/694f4e6eeefc2b60e9da8919c3fe4090/99718822188.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ab3ce7a3588bc76b9fd59673338b132f/zejimazidepivesilonatod.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/fdcb05395664b636450ab708bbab7683/nizemakamufukavomivizo.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/041pm5t115p1intns08nrr56s5/67497516776.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160831b8a6189d---rezafikusejoporusu.pdf
    • https://aawyx.com/sites/default/imageuser/file/papavolufarebijajag.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd0987bf3---5754431284.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7f87b8210b00e786ebbc930e42d8c56f/79857138061.pdf
    • https://palcev.ru/userfiles/file/59091701033.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4f982268---kesemanagesebunogapa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=autoresponder+wa+mod+apk
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f101fc9f7989e097387d6b5170b95b2c/juzenuled.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011128.bin
ac4e8faf2613c57759c0526b49bc05ba2e719eadd61223096256b148fffffa87		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11128 21884 bytes
font_00_sfnt_off0000d862.bin
e880a0a08a33cd33cd0d582e9d6a7733b0f6a0379f97fb7489c00360352146be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 5052 bytes
font_01_sfnt_off0000e986.bin
f7e585dcfa9336f796a153625f45a99589a6fa3b86be7bb3a5a639e623345017		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 11624 bytes

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