Malicious PDF — malware analysis report

Static analysis result for SHA-256 3845f0d5fb184730…

MALICIOUS

PDF

73.4 KB Created: 2021-06-01 06:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02fc03d5041e85b83283ce180007971a SHA-1: df06e6aab31fbc7fae8edf110c1ed43a7046f1b8 SHA-256: 3845f0d5fb1847301a1d026532380fafb835024727c6ff387e02ec2922da66f2
154 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body, though heavily obfuscated, contains metadata related to PDF generation, indicating it was likely crafted to exploit PDF vulnerabilities or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a567b5790a5---30248278255.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154a12d829---mitugakuwizajodinilore.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecd803f69---fetonufijelusujibanaso.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/663d1150e384722f19258ce74a986c3b/55197277069.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c890992b34---dekimudaduzosebaz.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3334rjcc58hlg4be0kf18b8td0/jobopigasot.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a7fcf347---44470550924.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/12881228f2789176b5aca736977e5a89/77392210675.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402edd1871---kavoliwafagisomugokiv.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gj7kdi5k1v1l6dl8dnlujbn1h5/monorebe.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f96e70f3---15695316909.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96ef86aba---pegukewiwa.pdf
    • https://its-bulgaria.bg/files/file/lukawuzanade.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5878cbea5b0047e1a542c82b94ed8b7d/gixajabeme.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/b4e01c1b5d05e4a3b1b0cee085720f1b/wepofojivite.pdf
    • http://palami.by/images/file/mimubexujejuxafuvagab.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bab3ce028---jofumimuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=suites+de+bach+cello+pdf+free
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded6.bin
c0999663c11d477efa6dca93d30bd2c805e2b66171044869f5f07ec187abba24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 5264 bytes
font_01_sfnt_off0000f0c0.bin
8e91c74363586cdb9dd07dd2534659372f23d80237be30185f5be27e568e7494		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 11772 bytes

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