Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab09a5bc1c15344e…

MALICIOUS

PDF

62.5 KB Created: 2021-05-03 15:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18d71e771f372f86fd7b990032b08709 SHA-1: f55feb5148b6900f0460d0808676b62ef0ac5e4b SHA-256: ab09a5bc1c15344e425c9cb8847936b9325f18f56654e1789e584a6bd2b1e6fb
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2eb02edf73cded38919cf9a5446ab08a/54452092840.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zadedazaz.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/393a2735f5bbe2c1ab12b25f7eb2b3e5/fevimekifegazos.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817bb12c2dd---tofumiwevixufimijinapu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcbbd8216f---87462908360.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb08cd5f5---kovonurasupodoluxomozij.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b78f70018c2f422f550914f2d2df98af/38036827193.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1b8a944711d29512bdc7ea449218fe7/48443037035.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607343aaeaa73---gusoputeruxukutunifexex.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1fed34c3060aa163d9f89374fa10e0c5/98695125215.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079fcaeef71f---wikepiwizubudoxapud.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4d9c713f---11822933994.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb536dd7c6dfaaf8f806df635bbf6dd6/35469063032.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4h9lru9o27s230fteg33v9i3oq/47022407322.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160867b8761d78---43414580532.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=obamacare+insurance+tax+form
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d832.bin
3868f3eec69e959c0c0d6ddd3699bc44feae1394cbe748cc11dc9fc3d94ba021		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 5232 bytes

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