Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a36815c8f94e9af…

MALICIOUS

PDF

67.0 KB Created: 2021-05-10 17:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6754ed5d61f7bc13428742fd237690d2 SHA-1: b444d26d310c3357a0e4db36829fb732b6f8b59a SHA-256: 0a36815c8f94e9afbcdf261706a0c931fbf6ebba441ca8b4f0a01fd98f8358a0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to piano sheet music, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9147

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://cructi.ru/uplcv?utm_term=the+entertainer+piano+sheet+music+simplified
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/4c2ad2bc4553aaf0fb6cf3412af325b3/84820072856.pdf
    • http://garderoba.sk/images/_file/limanijefipedimolija.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/drteomdrvo0jd8vtfno3a20kgg/zagiwutujuxib.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50dfa19e4---60452906910.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077345d21c08---82995199549.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464cd6ed73---voruzedarukifovex.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609486ba2d608---24114593959.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1345c5d9e---74789674167.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160810f2f3556f---92364777070.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8cfd20b05---60582937301.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1abfd97d1---vapabawe.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/07a00627a82bbe02c4bd1f3aad77b254/fopijolisovivadisikeb.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qeenslcpl5sh9p937oqn0n4up2/27773406437.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/dae13d6abc95468e599b190150e9956e/67276326455.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1c1011c9---64835865343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9eb.bin
43e2d54ed49c61ef77dfc9c2e2cecfc983bf7830d447393c43ca1f65444c4bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 5344 bytes
font_01_sfnt_off0000ebea.bin
b68f89b13e5bcbe3b40c423d08d6c6d278217ca6653ca6f36e18b293b68b4a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 9860 bytes

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