Malicious PDF — malware analysis report

Static analysis result for SHA-256 d039e4678d02a243…

MALICIOUS

PDF

91.3 KB Created: 2021-07-14 02:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0c5dbe205ae8019738b196bdc28e288e SHA-1: c352a9a8e5146e44b4d1ed59265a8f26bd82cbba SHA-256: d039e4678d02a24375f98d4f8d715bab30707b769daa4ba37a00849c7d0bd144
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to harmful content. No scripts were extracted, but the structure and URL patterns are indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e448c493a02---govibonodenulal.pdf In PDF document text
    • http://navigator-nsk.ru/userfiles/file/potududupesidenabinen.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d831fcd59a---wumoda.pdfIn PDF document text
    • https://asiahijau.com/contents//files/97235940844.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/8f5abea7b36f978a1d050ca9601dbbd8/34083827874.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6e22d716---wiweb.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/nozubepisomanepurufusake.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fisigimigezepuliguxetunob.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77ca324094---logerobazisapezi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/25193074271.pdfIn PDF document text
    • http://vitecolte.shop/file/dijimozisifopoxix.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/42720727852.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/pesunowuzojogoranenipamug.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/laladovuzizavekulojus.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b775ac4f8---sujefifexedanewetugerigaj.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/dawitigikoremi.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/tesodus.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d1cb1828ace669c96e770863dc3df3b1/noveselefugibevi.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/33087712281.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/97093471418.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/xulisevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+do+waves+travel+fastest+throughPDF 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_off0001010e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010E 17712 bytes
SHA-256: 9a05f9d901609483b85db695ce7df9a3b2250feddec1e90772951a8a3acd9ceb
font_01_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 10680 bytes
SHA-256: 9e98ceaeb08404ae4a07e7dc1e758edb0cb1b9f4f5ce90efe78f7b202c0157a7
font_02_sfnt_off000147f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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