Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c792da6e4d91e50…

MALICIOUS

PDF

107.2 KB Created: 2021-08-04 12:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7a2d501c9b2827216283fd12a3f8b3a8 SHA-1: 623da2b09e20bbb38c633620c683f5bb8bf38ab8 SHA-256: 6c792da6e4d91e5063a9d9a3a8e02e5e3d368c7ad2e322fde01c1277dabb04ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ketchas.ru/uplcv?utm_term=accounting+equation+problems+pdf PDF link annotation
    • http://ricarda-allegra.de/userfiles/file/xovizerusikurofuk.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zoxarasetugi.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/7776065318.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/litezomogoj.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c9687d6801fb4ea32914339d29c30f4c/firivafeni.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xasamutusojinitozo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90daea1c3b---dekogil.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608734ad48d44---wakigudirogasokogipotare.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9a4195694509ff6d5f5c3449ea72edf6/97602805361.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/nomofetigemejiteze.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608774d515430---tumejojido.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60959579858.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cab64962108e3b4e800a688a2b41a811/51730875768.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e95c70db---29868627051.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/75953327955.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1238c50c7ac9ff54e3f0507fb7518a8c/64250987941.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5b62fd59---nikuwuzexivavitufovewen.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/gatoxuzapuzulu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48917fd38---23607594126.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8e1386529---kovekodoxufujitamefozola.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sujifizirow.pdfIn PDF document text
    • https://dpmceramiche.it/file/kabugitoguxo.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_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001565d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1565D 11328 bytes
SHA-256: f13ca3136ffc855d371a4f8ae9a4d5727921d02ec682044c8ce06f74d4157535
font_02_sfnt_off0001704a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1704A 17852 bytes
SHA-256: dc4361374135e7dfb91a7599c10bb6fb607760cbf384ec9464e2439e241243b9

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