Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f004ddad0463a3e…

MALICIOUS

PDF

98.2 KB Created: 2021-05-27 20:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ff519dce7fce779cd4dc4ce13f9d8cd SHA-1: 5a592b89c4e63d2bf282c2310742886d3f5c1079 SHA-256: 0f004ddad0463a3e67ee15db699343810af965205e4a5e8113fca5e1dfb287bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure for downloading software, likely to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7037

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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4331a2aa---somopatumuviw.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8ehu2g1t8pgtj8s7554nl71j3h/dugarav.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a509b92f0ef---wavewofenezaberosamon.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/91a6a30e2efd9577601080563f0155c8/32569344740.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fvp91udcoui4ssd21512cj2tf1/26509425964.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4ef08ftv6o40lj7mr1t7brs8vk/ruvukokirujakexevibofile.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084c722472e9---49158272002.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/70000f5477b4ba23524838c280bd2465/sekaxabatomejo.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b41560bb---85106039552.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jqnd4dmehcvsc04dqntda9dhh2/43858274827.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca20cee7b---68629368432.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6ff9f35a---jagotagudunejibodifazasub.pdf
    • http://mywayrtk.info/userfiles/file/pesub.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea9cd4d495---69229158340.pdf
    • http://geose.ru/userfiles/file/subizivozixudizow.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39d96ff85---paboxew.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608657c233edf---ruduwuvutalomabop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vmware+vcenter+converter+standalone+5.5+download
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f225.bin
142b4c0b4c943d6bffa5ff4f419aefd226ff388b2e63d04c4afb8283960770e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 37296 bytes
font_01_sfnt_off00015838.bin
eb5adb4e26983a930e99f3701813e785abf761be74f81d4433d8c874ba71904d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15838 5356 bytes
font_02_sfnt_off00016a74.bin
257eff2cfcf261787d9c5b00c1205775d5dc11f12205cc1b527772281c0a55c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A74 10892 bytes

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