Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c03af5e97e8272…

MALICIOUS

PDF

67.5 KB Created: 2021-06-18 16:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6619b0b785c52aab4c0f4f4f46acc3f1 SHA-1: e9624701f31a8f7bfa9536b858ffc9d4aca92a15 SHA-256: a8c03af5e97e82720ff565953073c73a73b80a15f679cfe58ee24f10d86de9bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pixomot.ru/uplcv?utm_term=90+degrees+counterclockwise PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fbfe5c60b---79851538253.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85d6b2474---65217318608.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1381f34a---pabafa.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/38483419423.pdfIn PDF document text
    • http://ezibra.pl/upload//file/xexilapidatorene.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/45608943865.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01f903636---4416885372.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c86d61348f3735d8e26a96f0c119a8e4/gujafu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f88317bfdbb3dd465e56c7531a5308cb/foluze.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/58693867061.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3f2a29d4---pafadakibumibibufefefam.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/58188619712.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9b20b6a0---bataburabukegewalubelegof.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sotusobexodulujexem.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c501c5a540f---9190779199.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/28e96cf7899f2a483776a759191df040/30215325835.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/50816acbfccbf535bbf8862e4118eea3/69632048310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 5256 bytes
SHA-256: 6066882d087fe6b9721ae9679bd51ae5aed9baba99215b7dc5b6bc7b0779abd2
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 11212 bytes
SHA-256: ab16fe2cfc5739b088c758b705474ca64e77c8d72f026583a9079233ba3a95f5