Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa80341da6594cd…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 00:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dec08037948767e0cc9908d8a1f15c90 SHA-1: 56639efa0be1d1076af185e1e6e0789329eca31f SHA-256: cfa80341da6594cdeedfe218e3b838bf71356b5686bdb54c47a32a1eafdcf283
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the extensive use of compromised hosting for link distribution is a significant indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crysiq.ru/uplcv?utm_term=heller+ceiling+fan+installation+manual PDF link annotation
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a338e016a3a---74434594679.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4085ce82c26f837f25d13aa5941e726f/22527314301.pdfIn PDF document text
    • http://accronline.com/userfiles/file/51248413766.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde91894b40---filurenuxerurojamuru.pdfIn PDF document text
    • http://azizolace.cz/images/file/ginudibuwefajunofutas.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613183e6a8b09---velabidadusedora.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/571fe8d5e4b73c729689972230e638cc/87096924174.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/jopuboxuxilimejoxewowe.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/fefiwes.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/nemijuvis.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/ninegonegixax.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ebe42de8---lejekafukogabek.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791f5ecdd1a---79265899531.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab02af709---pupetobuguwewexenobedir.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fudipigidugukipividevetoj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2bcca9cc222bf611093c8d5c48f43db4/62069364751.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61dc74569---xufixemowo.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/67876627066.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/rjuj5dlj2ja5hpbbhrvj6kljfc/79858323473.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d21167c79a735724a9300fafd312fbae/67287466958.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/40680876920.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/xidizewewa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078f244944b6---deradegakibala.pdfIn 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://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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 18148 bytes
SHA-256: 4853325fbb8a4fa7ffdf1f647561d4ff1f44d702aa0c1daae98fba355dfc4415
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 10768 bytes
SHA-256: d93ac5746836fb14d2fe3dc6a60b3c85aacd8549921325ecf9997f5174c82c73
font_02_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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