Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c7e3050d852e99…

MALICIOUS

PDF

80.4 KB Created: 2021-08-18 07:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cca2f7dbb5ba09d887f67a72fc5899da SHA-1: 1ca9a7c818a295d465baf33a6a8928ff01ce69c4 SHA-256: a3c7e3050d852e9924823da9ec163da1ee6909aa5fa0e94de2e8cb23f06fd3cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

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 http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160765b15dd634---66451856079.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a774de100c8f66e3b86d83d6c06f86c9/11100920943.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c6b5d511e10653866deb2ffeea76ccd4/tisejirevubixonalote.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aebd42fa5b---58791977184.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/61960262698.pdfIn PDF document text
    • http://k1a.ru/images/files/file/3585318171.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/mubagogezorukaxukuxati.pdfIn PDF document text
    • http://fohow77.ru/upload/file/86366604289.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/54653723432.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f73925b4c7ebdca6d8cf51235ed3811/torupajus.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b151ae7b43a6d181d3fee1bace8e7a2f/32120615458.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/xetulanagebunagopifajolal.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xikenogi.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/35537999446.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/71640304837.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/5c4aee065ff098dedc56f185c9081ffd/mafidikamavov.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a207c60e---pusavipegedisonafif.pdfIn PDF document text
    • https://vpmemorial.net/images/file/98731737991.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/27252704351.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/21691002221.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/t8hshrn3nc3d659rhe2ttit1lp/romomadawasagigadu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946ba2e4f64---81873307021.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d79cc0690---29476283957.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/66352386995.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f2ee9d61---zojobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=abituriyent+1-8+matematika+pdfPDF 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_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 11048 bytes
SHA-256: 8a73fbaf0e6a7b5527feb8c7b8c242e5f05d529104e1736c17aaaa31affec876
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 18768 bytes
SHA-256: c03b9ae1d223ff08fe246ee1968d66a73583ef196cba8885286905fac2fc3c28
font_02_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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