Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe01cc9c58437ea…

MALICIOUS

PDF

77.9 KB Created: 2021-05-30 10:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3caa13fc03b64274f28dfc7a10533123 SHA-1: a625282edc39347dbc49c480a3473f46343ef64d SHA-256: 3fe01cc9c58437ea06bc7cea4a0a485868e2b90a8713fb1a5593230126100f23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8229

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 http://jrpst.pl/userfiles/file/xoboz.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bcea198b23b20e460ab02cbc8226c2a1/bikiwukumimewe.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0b303081---76116005463.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747a8ceead1---48481149173.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16090daf022c2f---wonibesunexovenoxasa.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a536c53980c---99017806761.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f3cc0d60e56d67eaa465fcbb2751939f/70334114340.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf57cc921---13579318687.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u2sk8m9bci2olcgqft09q6a1q6/fadazumi.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077899e5fd30---70245380124.pdf
    • http://maility.pl_adresuserfiles/file/47369568026.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/23b3dd727fc68fb88a9b3626e9e24ef4/ramilezoximezi.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc28c283e---88888755010.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dfec0269---22292232030.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01a275680---31583332547.pdf
    • http://afghansolar.com/userfiles/file/jobasudalowej.pdf
    • http://matsonconstruction.net/userfiles/file/renova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vivo+v11+pro+update+android+10
    • http://dejavu.sourceforge.net
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000120ab.bin
f55cfa248fde46fee3649d7d959d76a9b088d7ea03377f1492aa198944c65f67		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120AB 11651 bytes
font_00_sfnt_off0000ee92.bin
c79b19bb68e9262e79a190fd0a21cd0be10e6461f3b17f6b79c130bb124d6fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 4960 bytes
font_01_sfnt_off0000ff8a.bin
e5b9b66ba05611d8e9c2f5588ce7984cfca5db44cf23c71b6d73971d0101c4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 9604 bytes

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