Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a3094e8575058d…

MALICIOUS

PDF

90.3 KB Created: 2021-07-08 04:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f1a602ae5311e1a98e1efc0558528ca SHA-1: 7d3fe93fa1c91728c436c4eee493cd0f3d1e997a SHA-256: e4a3094e8575058d3ee79af3b71fe3a9b5831518ac7459e39eef391268c7aada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a tactic of leveraging external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=man+vs+nature+conflict+examples PDF link annotation
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7774b6e1---ganonawurapelukevave.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072023cf0dc6---wovokuw.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/65810980726.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160812c058c92f---85137568408.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/480792e70e16d383984aec33de2536fb/taboporulunazobeworemi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50c7c10f3---nonagokazu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/21a3e30811aa5072ebaaa6837518ea31/daribarupufozimefabi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9g9vlr7acrkhs1p21nte9se2hn/30572287360.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zisowado.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811234c8d82---22352309070.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/cpn29kupltbep4pf3gf4s1epue/xiworarefejekal.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cc1bd372256e91f702fa50994b01ab8f/11827419726.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qhsrvtr2ebk5u7j7blfgpnr627/soboxisi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4721751314.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097798dc6be4---nifukepemuketim.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e534764be---pibabipe.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/68425805071.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/fajufovebumeti.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/tojepetuparadot.pdfIn PDF document text
    • http://aimic.com/userfiles/file/48046113346.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/v8r0mt9pj0t6otdq9buen2jsl4/dowujuso.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160891e5700583---lekeja.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/rumakowixaxusa.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/najijemipemibejigujep.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_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 10900 bytes
SHA-256: 6b66b0e7b7829fc80e54cf654768625f85e628d5f3f00ffe2cc8b4d2960b091c
font_01_sfnt_off00011710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 17424 bytes
SHA-256: 83f2e0b2394530f6f4a271ff37b004306ccef4115f3cb7f361b99f5ca3fb15c6

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