Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b1a76d50f637fa…

MALICIOUS

PDF

89.2 KB Created: 2021-08-10 17:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e36b72ce305769994eb5788aef1791a7 SHA-1: af4b5760242ec046cd253eafdf1615946110c694 SHA-256: 06b1a76d50f637fadf2ff5f680607b84d3a2a993f717d90f0ef7c60a4ce25618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs hosted on various domains, many of which are associated with compromised WordPress sites, strongly suggests a phishing or malware distribution campaign. The primary goal appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ad279576eb01fa1199abd0a621fac4aa/jademumuxed.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee2d823cc7---36460445454.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f733ca78c1f---dokigexabavodiv.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/welalexuvitefura.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/93275166583.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/93be32db7d0decb5c4cb9b212aea4564/95618402583.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/nalimabomagegiginab.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249d521df9---fakerezanosujobusozem.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bab108a0d83---8179577995.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/jubunuxuvedupabilo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1bef02b2f43fc695905cd62a55af5340/xupuzewe.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac60f644f9c---bepola.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160838da2904fd---gapipevumevi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5956a8c40d---36888397264.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/deh2p90tckuh39du4t9a3p243e/zujugidedojamitopufi.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/26145251045.pdfIn PDF document text
    • https://coil.hk/upload/files/46600096114.pdfIn PDF document text
    • http://naucseto.cz/storage/75379494336.pdfIn PDF document text
    • https://tsegypt.com/file/53874534309.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/nojixepiwujuzusolinibu.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/fatuvaleb.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4n97ku30ob290dudp7ung526h6/29610207134.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44b747f7b---xerobadawuzufogilowu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae67b292be---kanowoxawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+online+oyun+indir+clubPDF 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_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 19776 bytes
SHA-256: 2c7a87fc8a675a9e82857ebc48681e2e32cff5fb6908d93928222e1cb5c2f5a4
font_02_sfnt_off00013d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 10720 bytes
SHA-256: d25f4882a278b57d455604143da4e430ab8dc8825ad4a48a86e66fba8bd7bdff

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