Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0736c790b7a1efb…

MALICIOUS

PDF

65.3 KB Created: 2021-06-19 14:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d3a4b8fbf6290c05306e8e59bde76c0 SHA-1: 1d842d7f6878a689f244042deb0aacd9ee3f46fb SHA-256: b0736c790b7a1efbb4773e7b62bada8ed42360a448be6bd38d39b2a7344161cd
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to PDFs hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/puojt46dct7ukadge2agk7neuc/81091063134.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f7c6cb4253f0052d6c3e0109d2ad8dc9/tugatimijowuxatunuwa.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0b0e1cb7593989cc2ca22da6c4c15e12/94579832940.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/dc3e95528436f8806f87a5fc4c23ec4f/38468761557.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/kasalatolafipu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/be3f72734757a70b39ec6eb4324e7653/poniwefavanokeve.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430103817548141.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9bd7cde7a1c44c4eb356fd132aca91c/71582579633.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ms3rmjbdgl0pimh2htvie1h677/xavixaserujovuledobibam.pdf
    • http://kasargod.net/uploads/file/gaver.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/i760j5cbm6aqulqu0dqadnabuv/93913491401.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/16adbb8f5c2450db8c547b58f62fcf11/kupokipekonivuponevomuj.pdf
    • http://congtrinhnhaviet.vn/upload/files/mosoxanefuditubovuxefe.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607571777b848---16597017914.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=avakin+life+5+play+mod
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c7.bin
68c5681fe34698f2d0144e2af3539f819a57ec219e63a1feba3047d7bc0e40fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 5252 bytes

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