Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6301db5a834a153…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b798506ad0cd5f75dd6add0a27d8449f SHA-1: 4c84412ca64150553182168b8d850dafcbb78dd0 SHA-256: e6301db5a834a15337f79f69285f4900687bc218d9fd320c620d0b75f80a6454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=gold+forex+trading+strategies+pdf PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0fc4efef---vejabujalif.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21126c7b6a---55985528219.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/25500859727.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/rafona.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091142b97001---xebunuwowure.pdfIn PDF document text
    • http://jar-ted.pl/file/kebuxab.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/rilet.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/papopazotamedip.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/67343803436.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/018d6f56abddcdbf4ca88d19b8ead78e/66978372594.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/b373473su7e0a7k9b2a8pq0ih3/genejumev.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/xatep.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/33341725867.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/nuzanikafinizosuwifot.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/80358004647.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/94411189617.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210819001747.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5d610a90---vokefulolatajajibasiwe.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/13706730092.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/49421199947.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/sewewul.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/puwupexemokebidowi.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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 10812 bytes
SHA-256: 604b91f6a17a6a40f4dc437f1a6be2fd63d3b7183fc2dd14823be5c552eb4307
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 17508 bytes
SHA-256: 8a2ff9a2e36e5dcdca486d6043e2cc39e8a3b8cb85e0568f971a8c7363ab1ef8
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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