Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b8d0539b571c39…

MALICIOUS

PDF

115.3 KB Created: 2021-06-19 11:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 935f3fc800be59d08eb97825d73acd16 SHA-1: f4b052016ac6f259d7adb5746e07bdeb5dd392d9 SHA-256: 38b8d0539b571c3903264f9e4797485b39576a9b7ac0bbd73cb59dd6f391e715
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://medvor.ru/uplcv?utm_term=westlife+hello+my+love+audio PDF link annotation
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/i5mdpsqfss78bo2ge8kldhl6v2/50943272932.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/if0lu3ccfvcvl93v9sjerv8429/nizuvitenotuzemuwat.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db991b2f60---36622413781.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4347ee70addd17e6fafc9172a7dfabf3/pewuwawemopabebizeg.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b361377bef---50220054177.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f03f4203689d40aa5aac4c1c41992c97/84494776610.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d996882b3---lizutajalifazef.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fa1f04781de2d22fbc28d28bb5b3b508/xigawu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bdcc66bb936daa5d3f90e858565ea28a/disaka.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160749ac5ee2d0---69604624507.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/85915573600.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a6b07c58---bovozozizotamojo.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vec3h1igtb5hkmevm4a5m6idnh/13256015197.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec309e3791---pubeladivifoveti.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b889853eb---56587498236.pdfIn PDF document text
    • https://clinicscrm.com/img/files/86072291332.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/favusixujebekefaxus.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16081c43acf680---50742082508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EB 4240 bytes
SHA-256: 35f287f2112cfa9df59b00f8ee0f1ba114bd20285563a62da0c94fe7105521b1
font_01_sfnt_off000172b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B9 5224 bytes
SHA-256: 2893711fe7582b3721822859388e99aeb49c646f8e3b7f5fcfa33baec6915bf3
font_02_sfnt_off0001846a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1846A 5164 bytes
SHA-256: e30ac1ec410b9d5c557053cca1f9d706331d4483075a2018c9193cfa74adedcd
font_03_sfnt_off00019321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19321 13800 bytes
SHA-256: efbe977076a13cc459fe7ea11b9e5ad3a40e3d0c24e9615c7b17e56bbf5bb680

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