Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee96f4c3501ec725…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 08:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25d927006033a1b2f4dadd02b804d509 SHA-1: 6b7eb78d3a413d61689315ae3fb0e69197b4b1c5 SHA-256: ee96f4c3501ec725580a683982908c12b9fd581059a66a94f2b4cb814fe3fcd0
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 of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of a link farm suggests an attempt to direct users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=comprehension+passages+with+10+mcqs PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e0e81e23---26533476021.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16089bba88a18a---21248226008.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee5f0523d---terukagiwixod.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fe9ba9042---gusifunekepuvan.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/27071156844.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/01911835b91923f835d73ca9a8f61bb9/vepiv.pdfIn PDF document text
    • http://artdental.hu/editor_up/49246918227.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/98174731465.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d5cafce6---namekaxasinalobamo.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/ximakumagona.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/72385504987.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/lexusimezutitab.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/tukutoveka.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/krfuvgb1ccou900oipqpnf2hmk/zuweratabofamekadi.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/96602570905.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4650961a63beae7293ed57f09871e3c5/jixirejowutapidumadakened.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9a9e02a2---27258179568.pdfIn PDF document text
    • http://fkhd.cz/data/img/sanevowifezafuwikovori.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fulenepimivorubelovudub.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/16777620166.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503091402531920243.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/56787480839.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73472285298.pdfIn PDF document text
    • https://atl-50.com/files/file/73737834408.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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16776 bytes
SHA-256: a007c7bad073e89195c649b622c139c443e1bf45946a2e206d36a08065c92e72
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 11212 bytes
SHA-256: eb5a9e31d59dbc7251c7d85251e2184c18bb6c2ed6256a03c2d411546d5e60ef
font_02_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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