Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd8a67897293b6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 22:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38975b66bc13fd4aee8c07045b0e0d5f SHA-1: b91329e385929ac4ee725bd2271a21913bfb606e SHA-256: debd8a67897293b628d84ae09e2862f907e1b7e985c91b7591c621d67f44157b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://strategieb2b.ca/userfiles/file/10235511572.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1d2d7aefeb1586fa9d55b7a436551455/nezinaxufanubimasiwavarux.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/721197304.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210821193625_66wgdo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cad333023---vododokasa.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/wuwigorupasobobipitivot.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/kidizodufolitusujemebelav.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xedujefibu.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/fumavimapuko.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a77c0951---56843707381.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/77010439656.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27abdd4e46---tasatupatoxaredakimisi.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/wivabegosesu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/51734077272.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/98348050805.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/notixifisesopejabufatu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/d77cb55b8a18a6e41b8869b061dc9b4f/25159116978.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/79300801177.pdfIn PDF document text
    • http://lawngo.net/fckfiles/32121185129.pdfIn PDF document text
    • https://bor-diing.com/upload/files/lavep.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/bubisifiwuzuvex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=madhyamik+suggestion+2020+history+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_off0000c6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 11440 bytes
SHA-256: f33ac99334a50d9dd06ac0e96847d3c56022361e39bc833935fe49ea38779f8b
font_01_sfnt_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 20308 bytes
SHA-256: c7f405d6d13d3995422c7d9c7965c78ec9de514986eec813e92e39a17da9afe9
font_02_sfnt_off000116f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1