Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c041ae4146a9ccd…

MALICIOUS

PDF

83.1 KB Created: 2021-06-10 09:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f8fb0e71db8694d2012d423dfe7a442 SHA-1: 3e0d189125bef2bfff8ade99efb2e7f9d0b10535 SHA-256: 5c041ae4146a9ccdf96a472d0981cf3f2ee4e5842382caa3d3512510ec10be62
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt to lure users into downloading potentially unwanted software. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

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://archism.ru/uplcv?utm_term=vidmate+app+download+link+old+version
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef794763b1---96296526782.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb106ba1b---1689753000.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b573848dc2a---poloramexapovo.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/c7505f60a0456bb5da2ffe499f4410d6/wutebodafokulapep.pdf
    • http://dvarenda.ru/upload/file/kovuxubuw.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad33e7edc72---55251150383.pdf
    • http://kotolantopeni.cz/file/50855828086.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160944051f020e---dejisopisu.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084e72fb2573---naxasenumumiw.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f3edf617---potapukilufuzivepibal.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb87524ac42---talotejononefeveje.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b3a97d8f---55266809336.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f3165049---88384647244.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ff141b51c842071084b0fe45e9a1d755/kudebawopeguzodok.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa32664d33---4912785872.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/bulufewelaxefosasi.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606fafb1749e8---sadutanozimip.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a1occs2qq41c7hqlcbl3d59ft3/dawapo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001084b.bin
a5537a1d214f9d81a9697101e728fa2ee058714e8fc477b646d61cb5cf45e1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 5288 bytes
font_01_sfnt_off00011a41.bin
32930e0bd5b32d92aaaf8f7564c23908e6d49b4d5c78fc4a2eb59ad1ef918733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10888 bytes

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