Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a463c93b8f1f1f…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 14:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5811cd5cadc41e500a905deacc7ca608 SHA-1: 5e53af5c8a771dd7db05b6627b9368388c92934a SHA-256: 06a463c93b8f1f1fcdd2e6974efcf43266c9aa986088f6d65404d6c0e4d98895
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/artm52va3ulj92pqlonel6oajj/26538823034.pdf In PDF document text
    • http://kezheng.net/Upload/file/90794658256.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ee586f68---16246300747.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/83611682289.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40993b2107---retokubuzuraselemilebij.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • http://palami.by/images/file/80445991066.pdfIn PDF document text
    • http://juentai.com/userfiles/files/timimiwelopomesoxena.pdfIn PDF document text
    • http://candientushinko.com/images/file/43191413406.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cba38b7ca8b---96151511918.pdfIn PDF document text
    • https://kamedia.vn/data/file/fonevosuvedowozezakupo.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/wexexug.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/54391052129.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d826ed2934e---wadugivop.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c111fa6306---77491311634.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8256918cf84fe80fe6da2933dbea9839/pepamixarubiwuxufebabi.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/pefitanop.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/mesukikitibagivejuxeroko.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/28125132837.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/ruxolemejesezunufobinan.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/34099158422.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7747c5ec7b1a30c5e1204a81f63b2230/nosipegimozarisegu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/zerereruvejef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=financial+markets+and+institutions+6th+edition+mcgraw+hill+pdfPDF 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_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 11488 bytes
SHA-256: cb0f76fe81ae538db6cbbe63f1049f12286aaa49e6a811736ada47f27a16141d
font_01_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 18796 bytes
SHA-256: 2efe75c58126dc01b877c30ca0e76a53b8915a8304c602e5345088c24e30c1c7
font_02_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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