Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a67824e2ee72e81…

MALICIOUS

PDF

79.8 KB Created: 2021-06-25 12:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 256a7ea64a93a6dbe8e550b2c9fff170 SHA-1: 62bbe63fdf18e5909175b221ea793fbc46987f3a SHA-256: 7a67824e2ee72e81b0ae42a294778208bf8a2f817fd6d8781e456cf5f61e6303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

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://pistant.ru/uplcv?utm_term=asuran+isaimini+full+movie
    • https://vandolderskb.com/images/usr/bipakojiguduwubobodeg.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/dfp6j9mfj2bqceujs97rdhn8tn/96419325868.pdf
    • http://laweasy.kr/userfiles/file/povoravodig.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee9777d1bd---zarozagudu.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad864aa8cde---vepewafotasikuj.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7bca7f6e5f5f2bb5748c088900b8cd35/37652294952.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/533c38050ec404d42564da0df76b39a8/81813010144.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dpu7qjglrgkhs4o7rsotugh7tq/bedapadexovotexutedid.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160922924e9bc3---dinizoxetarolewup.pdf
    • http://nousgarage.com/userfiles/file/63771270026.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voxowamijew.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d572f73b90f3fba949f39adb3268b5b1/67643586157.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/21132485014.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c448d46b---74670077423.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50fdc94813---79060798747.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d2.bin
38c86b064342a7ec288345ace1dd03eaf516350551f00390e753cf0d103790db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 10424 bytes
font_01_sfnt_off0000e874.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 16792 bytes
font_02_sfnt_off00010086.bin
b89549eb5e1937d737e29cc93c10234692f2587fd0f111cd3ecd7bc7039bbeb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 18496 bytes

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