Malicious PDF — malware analysis report

Static analysis result for SHA-256 a664f9dfe803170e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 18:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c15d3613a19637a3dff3cabb3436a84 SHA-1: 264cbc8dea5e5605ce12225c82bca6886822849f SHA-256: a664f9dfe803170e81011e00295cf62d206c84d75c3ecae3b2d61bc0f7db6957
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish for user credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kaptenhoki.com/contents//files/lunifepose.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a191db7a---xigenegidowifezikusaris.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/zigalifopaxololig.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5e065745---97999004361.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/vudabesepila.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3047723e158f8a15e47b802d536ffe7d/72965162712.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee886a00c0f---subuputofojuluzumod.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d2045443e---79820792773.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/9402118952.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5qum1ktmmg2bvjgvpkmajevb1m/womapasos.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nilnq0pagvtvvv671fpf7e3424/linofodiwubiburonotivezap.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/lovekugagopowadinukepaju.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fdcab895e47---12294770687.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073624665429---60775898679.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/gatuwinanawizalamixedoraj.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/zedetolegapijanonig.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/89201750714.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/soxikenaz.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/91868368602.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/36612721769.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/mizapepileradivofaxamipi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b957f531---xosiwixolusunuw.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36f900f95---44199205402.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf339c04a8---pususivosekozorexoxirefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aviation+control+towerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 10188 bytes
SHA-256: 24155f9e80b32de56b8ded31522c6396057dc354c97e1dba26d848aa29d4dff6
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 18116 bytes
SHA-256: 9b13a7a4e544ad7bebcb33e9085791db3bb0f48b66eabc276b883ef3d318f148
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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