Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedc60bdcb6ffa96…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4673257d1270f32a94a35052e7a8406 SHA-1: c6e82635ce5439027968010e096c5ad38c811dec SHA-256: cedc60bdcb6ffa963281767045573ba3f8e104dee2e75b084aa57cfcaf660970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a link to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=pdf+to+excel+converter+without+changing+format PDF link annotation
    • https://essuances.com/ckfinder/userfiles/files/niletirutaxositenomif.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nijifavekurijadelatiwasi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142551064d1b---46672895432.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/jimakofezubigisudivu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141dc941735a---29315631173.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613712f83c987---katabovarowuxozaw.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/11658159900.pdfIn PDF document text
    • https://cargotavio.ru/files/file/40466274981.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/58251843782.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dunosag.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135cba4af279---60019822827.pdfIn PDF document text
    • http://parlagame.net/calisma2/files/uploads/gimosoxudije.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/samovusumubesudarosuno.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/32409054081.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/15092930323.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/65858995287.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/10965746296.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/dapositejuvigulap.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/topowogenamo.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911024514.pdfIn PDF document text
    • http://krzeptowski.pl/file/velelimutavoj.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nofudonaxuwusulusipud.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 17252 bytes
SHA-256: 6482e375c0810244d0c20d7c2909fa4c97a863b5a6b6b727a6ea1bb233f765d2
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 11108 bytes
SHA-256: b7a1ff2f708e90b3b0b7f1d1a9e9e4a62b1d2aee77350f4acf6e92713f49ae6a

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