Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39be2cc23ea8809…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 21:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3564da5dfa8fe1f357002e457c73921a SHA-1: 381474e7ea52bbc5d5c955d947bd2d02a3d1b879 SHA-256: b39be2cc23ea8809d5f35f45f07b6d92008ac752bf390008a74f4b125e789702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=the+art+of+war+sun+tzu+pdf+download PDF link annotation
    • http://www.fdconsult.qa/public/uploads/cms_files/14044509066.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/94399931003.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/vudizomupi.pdfIn PDF document text
    • http://domario.ru/userfiles/file/47961328485.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/438eb86d5ca4b1c827c4e763826596ba/62665059487.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f0c867b10ec0302f799259f1baa77c78/79158568602.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e438dda0be20ff98cdfd580d1a6fa768/balegoboketefet.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306dfa8e9b4---wojikedapilexonojibota.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/73390780470.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/sejeji.pdfIn PDF document text
    • http://haki.vn/uploads/files/daxujukisananonozabanex.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kibedo.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051436161229.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/padiduzedupelezizo.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902133109.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/80233663881.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/tasir.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/97149590571.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/43518982240.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/magibakejidez.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/85986018577.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/movoref.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea2086ffc---kupuzelozopojorevexukapil.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/venowazup.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/molemoxesiged.pdfIn PDF document text
    • 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_off0000baf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF5 10712 bytes
SHA-256: 88cdfd1c647c2e602575a2d5175c666c9aeaecbc4d54a011116673a90960caed
font_01_sfnt_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 15240 bytes
SHA-256: 3ab1f8c3e56e6708cee690c73ce4dc0fde537239fe944082ece29142b834dace
font_02_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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