Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17a62dfd3789a3f…

MALICIOUS

PDF

93.3 KB Created: 2021-07-02 15:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8c72af42b63119c87bf763ad5faec64 SHA-1: 4ad223b4a384c5ed94e2b611e667f94282c5c748 SHA-256: c17a62dfd3789a3fc37f43c2704267303f9fca9360f27f426cf4fbdd2aea8ddc
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f839bb5b---zavozozawugiforojek.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a27416cba14c812adeb0b036c1237aad/49620372214.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tqbbnqumlqdurgfdh8j40p7b61/luxavimawe.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nugid.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c65c35c9d---64850458133.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ro3e7mulq7ma9k20ore1t8p00m/rufuge.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/c7tn5dhm3ddjecq4ge2lculde5/90116734104.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb514e8bcbd---75007277782.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vuwenuzofodatoxotize.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/43857728324.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/meet00t80ec7h4bnugthp7dj3s/lobexuxodobevofi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a328506d5---juvawumiduxi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/rilositalikerope.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/76695577332.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/af2omi43m45nru7mqm45tk1hel/tisosevapodojusomozowum.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/nazepibijinekepusoximeta.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/871baa38efb489160a2c1f06352825e3/xemevex.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073085dcba01---telemal.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ffe3ea9879ffe86be90ab36935407ec7/6644246093.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efad4b41b---19112899159.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/tetunibilo.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/83977597122.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b740696c6---45453044800.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/edvfrp0o8huvbs2u2ghrpb0cj1/95841716793.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/pawem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cooking+orzo+in+brothPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10200 bytes
SHA-256: 885e7d95b08f2caeb6ba6819bb5c2dcd3661a83a292f228e54c1524a063b0514
font_01_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 16920 bytes
SHA-256: b11bf0c4f2791cdee935fe9ee16cabaa476444d3f54fa764d81aed587ca1ee7f
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBF 17704 bytes
SHA-256: df2ff6ffa34dc266d507d7442237d1c743aeb692291e1e48bdd71fdb0f66efb6

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