Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cffb235a895455e…

MALICIOUS

PDF

80.9 KB Created: 2021-08-01 22:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2240b15e3e5c304f5a2b507e860ea95 SHA-1: 508ac0be77d6e5cd3c83432fd0c7da72dae2145a SHA-256: 6cffb235a895455e18a723be03c30e99777596b9b7eea892c3a2f874d4e82dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content or phishing pages. The presence of these links indicates an attempt to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/rtsen4kqaqbpas0cq6ho5s4g0h/89922371438.pdf In PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210624_09F75BA0BE5D22B4.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/71107220083.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/90750464909.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/63385209292.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089c33e41da0---78789002740.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30c37123f---bujifototewitovenubovip.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/fba43b1843aee96c4173fdf405f565a9/36223952557.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/rarosojo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/18682331027.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31311eca42---dotafumilufevigosekuwik.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/39995ba530c9610fd184d5efad5b303e/6362469007.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/f37ejlmimehjt1l3t6dl3pco8e/paxadejomuxiz.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078a072bbae9---ketusalekifevugabukuzinu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a5ec6af0290cdc142d146c1d5fc6a954/mipigepigopolireniw.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7438382a083047214e459bf68fc4c5b8/zawiwe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7e9111f0---17379198523.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/99b105061d94c0e65346c8a2fc09f3d6/pedisokepunugapew.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/84880159809.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76232882005.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/fuxotaxo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/31451436014.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd656326032---nuzasofitesofagafetu.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/22815821702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=problemas+de+aumentos+y+disminuciones+porcentuales+encadenadosPDF 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_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 11028 bytes
SHA-256: de8049ca48eb63957ab2f59851527b5cadf55c292fcece1b72abb38d59dfe020
font_02_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 18344 bytes
SHA-256: 403163da795d7698daa8fd7a5639d54cfe214ebfb064f9a0f07cdb9c47051eeb

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