Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d0ee72ae7d46d1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4e07cbd7cac484d97c4f7adfbc49c07 SHA-1: 3982262143f5aa8e4b30624cbe92b3ef78b8fa0b SHA-256: b5d0ee72ae7d46d15cf5f8a9034a4758fa9228ef8c892b6844fa2d43063cd61e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tramtronbetong.com/uploads/userfiles/file/76426643315.pdf In PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/watodabarokesot.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/33236056332.pdfIn PDF document text
    • http://special-pharma.com/upload/files/nusobu.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/zobevusigijini.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/barimavotonozunop.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/83608438240.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a214da836f811e68265844b4dc339f1d/fijepukipulo.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/35901191701.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/wizuvovojebivupisaperifap.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d164165eea---25321249919.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/rudoj.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/16445086607.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/befupijotolo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5439659938.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144ffb1ce121---73740616167.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144024869bfb---16419565701.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bopunetalubopusixezisivow.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/repojepotelumesadag.pdfIn PDF document text
    • https://akvaguru.hu/user/file/64055089183.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/10289579278.pdfIn PDF document text
    • http://safarang.com/basefile/files/48499846338.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/buwepugozilek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vitamio+android+examplePDF 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_off0000b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 10456 bytes
SHA-256: 8b560efcdf81caa4651d809990da4cb2e37aa77881b50b65c3369b657a2154bf
font_02_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 19636 bytes
SHA-256: d6a6353c79ecb017440983914f3b8db72a35c36bbf5ae5e1b87af5c57c16e5cd

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