Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad9581029f26d86…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee224b65412a24236e99e873cdaf0f3a SHA-1: f869ca9c645ea7dde523926741fa22ec0999677b SHA-256: 9ad9581029f26d86604e3c128bde2e910e021991df445a5c723d97735241d24c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=how+to+keep+multiple+wallpapers+in+android PDF link annotation
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408c2cd312f---17291807153.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/xevefuzet.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3stbj1rsig4t30blfjlhnjvjon/29003717238.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/duzume.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/morofot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m0ncblmhrob053i2givv7kjh45/31503433799.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/84039402335.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f27a6b7e---runisa.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631070601_1.pdfIn PDF document text
    • https://rais.bg/uploads/file/96455985917.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0476de13---22585972990.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109061359179605.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/rudilazipasozaneto.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///14621077552.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/16653925292.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/pimidiwabuxitepiseji.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecefdcfef---51355254972.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cc4c6e2b---12035500011.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/ditafatinotugefegigem.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/65182d10e47620606b1b8cbe6b460e15/pemawetesuvibupoxopoleke.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6290024765.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/71923448075.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/16865971958.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/63367016890.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/52826574578.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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 17376 bytes
SHA-256: 766c8caef133fe33e9ff6d1cdf83cfcfeb7c2b638d2d699da0883dcff8d52078
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 10824 bytes
SHA-256: ad5fbc92f9137a83aceb656fc0bc50d75efc7edea6fd9d7973a07ce518f538be

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