Malicious PDF — malware analysis report

Static analysis result for SHA-256 932a4bebff811e73…

MALICIOUS

PDF

86.6 KB Created: 2021-09-22 21:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13c6cfe7f4683cc24b1bb1a3bdd40eaf SHA-1: eecec822545bd1d96623f45bd0644bf8058284b6 SHA-256: 932a4bebff811e73fcda7e19b5b1e894b9eb4e5e5f4f455081d702d0d28c8c22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://globalroomplus.com/bot/ckfinder/uf/files/27205130762.pdf In PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/46344464858.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/xizulojutelewor.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/zaxemorezeguparib.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/19584233515.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161468ef3c20c9---nivuzavol.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210902_EAA666C94316C7ED.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/roredumowivo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/869c2e953ec1b468c22cbc51d4243bf4/12596258358.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/lifafoduzapo.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/57757690577.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dulalijalufif.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0b753c784---zuwezobisok.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/55950959414.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/puvipefuverikuniworetu.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/ruvubupemekun.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lakosejizasu.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/1505192353.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/71444074893.pdfIn PDF document text
    • http://namngonviet.com/user-/files/zazapipuzevedagewenulop.pdfIn PDF document text
    • http://cwesp.biz/upload/file/melat.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/vujomibumek.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/24411406404.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/gutelemalujixagodonaj.pdfIn PDF document text
    • http://candientuvibra.com/images/file/suxararijuzebunufibapibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wwe+mayhem+game+apkPDF 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_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 18500 bytes
SHA-256: 64c270f4b98a76b714789b0258442e9b7a115d0bd9734790a7a18bfb5ea33338
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 10256 bytes
SHA-256: 3ede93e71a19c2439ebf85737824d9fbed59b6bb72427bc32056a377d4e0e3bb

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