Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c990008f7002536…

MALICIOUS

PDF

76.9 KB Created: 2021-06-12 08:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62a5ec9edf73e8591b074f5fe59f289f SHA-1: 406c56e471798cae2676f3f1b42b5bd5af8b3ab8 SHA-256: 6c990008f7002536c2a8b07c76bdaffc10e85714acf2719ab09fb327cb62c8d1
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The presence of external URIs and the overall structure suggest it is designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://smidgel.ru/uplcv?utm_term=power+moon+12+wooded+kingdom
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e89f3caa0---68988374847.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e260066a4---60024795026.pdf
    • https://mytekas.com/UserFiles/file/gadeb.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/00516e0c946b25ed6fea4685f685149f/47438267898.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b3f24de32a5370c78de4e9f75232225a/givalewodufajozadadinoduj.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a3bba1586d26719932ad2655068328f3/47832779367.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89afecf91---12990078203.pdf
    • https://addsfly.com/userfiles/file/30799457009.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608489a7b9898---wadanozagobekaxadavutagav.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d424cd5fd2e7f21c17f04a349a9767c5/89242421475.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c739a62d6---bolaxivomo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fcbfc23d36e948983f725d59493769e8/39729972645.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ababbad36---lezuxazifopiberikimonutu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385f3bb7d5---mijofotetovonawurukumugi.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a485e22c959---42214724996.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc1fc7907---32628213946.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c11c52b5d2df74cf7693b1bd854a509c/tefonugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22c.bin
12062aa75a3039091af5530c13251b7016fd6d628f7b7212769d98a4d4894f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 5068 bytes
font_01_sfnt_off00010374.bin
fcb10e78645f89ae9c7c8e45e3667cc70163890bc0ecee1d1e5d87e06eeb8e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10284 bytes

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