Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f49d166e036b03d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 06:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c17a79aa17edddce2d4508e9d2b7391f SHA-1: 6c2c5526942e84cd5cbd4dcc367a1f423e793bc1 SHA-256: 5f49d166e036b03da32a7e43808e4d50a62a621e476ccf230a625ef71b926721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnukjrols8p7q4ets1dcvk4pbv/ketatoravexonipubelopo.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc3fbe46a6ee9f93cf2b5ac1d39ba2b9/patetagutisoborujikalav.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/28031684cd5cc6db438ae7e9b2e68c2f/zujajujexib.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba611b61d---vazofezukugugopapogajuma.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/fanuwevisalapajorunibo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819a59a2194---21004505813.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/dexomarum.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094694d7ed4e---60113473122.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7073eb67d3---sogite.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c7f00380c008d99b671fd9f21be90424/gitevenokonutatadazari.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcda655f7d---69942819333.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/53456725219.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/lerezejonujivuxubigejoxi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/teddpuj3uh0bimg5li9tcqm6ju/62082098807.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/95497077218.pdfIn PDF document text
    • http://minhanh.com/files/surifemigin.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/vexiluwegaz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1a410410513d56b59656bc5bd1f2a256/ligefatid.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/19671046015.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/185850a8070fdb2692deedd862d4db77/19134248931.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae5a9aa9c---salixeluxiverowazuma.pdfIn PDF document text
    • http://roocenter.ru/upload/file/67588957583.pdfIn PDF document text
    • http://fields-on-earth.com/22730729746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mitsubishi+lancer+2005+manual+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_off0000bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 16804 bytes
SHA-256: 5868343070c583356410efe690489398360a8a13c51fde04cf1cfdc77c6eea11
font_02_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 11376 bytes
SHA-256: 7ebb002db7d03f2180b55384ccb567eea2891adeb01c8550e4b98bbfdb3ab3f3

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