Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e835cde3c9a29…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 09:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d0b85b8e38fa1a6e20aef98f5f211c7 SHA-1: 5a7fa52cc50610d4daa1c2251e09dcb0424bbc9c SHA-256: 4e9e835cde3c9a29a022b69756d66121da58aaa04c3fb5286340bc691108e680
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 trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=esl+conversation+games+pdf PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5818ea0b7---petiwutiserexapazav.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/dotejipobobikitozo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45bedbaa3e---11101492269.pdfIn PDF document text
    • https://olterus.com/contents//files/63430605677.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/4877928728.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/bikavavorarenilut.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090214175521571.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/84486281686.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/19724417814.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/992b5c482ed5367239a7827d7e888b34/44931975123.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb787e0b29---kawigovexilex.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/xuxajexodusikaza.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/tetexagasesuj.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/67032209028.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9b059c3682510b98c847d87e9dde496c/wafego.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/40155065629.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9ab55023---63353940195.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/paxebopupolegixad.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1106f1f3405710d505d9e85319e30a4/gisulax.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/38808179043.pdfIn PDF document text
    • http://punaide.com/userfiles/files/lezepezutake.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/26691007230.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_off0000c138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 11012 bytes
SHA-256: 9ecc58cec6801f8e37ea94268e8148f8289c8b174e50923e8d6a971a52803261
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 17180 bytes
SHA-256: 001c52c97cb9b7e7f729e73d1da37ad2abfb8f72bb86cec88304b2fd34e67f1b
font_02_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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