Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce4a0c17e55d459…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 04:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8028fb5df2a858fef3d01546fec0a5f9 SHA-1: e6e28934435c26f2c7063b5cedd4af45e9d720de SHA-256: dce4a0c17e55d45927d2b706fe0deab9bd7567fb56db3610def0222be2a3f426
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous external links, some pointing to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+sa+not+opening+android
    • https://vidaleve.net/ckfinder/userfiles/files/84826526937.pdf
    • http://www.alcera.ca/userfiles/file/27637471586.pdf
    • http://mediedil.eu/userfiles/files/38983088693.pdf
    • http://scandirent-new.ru/uploads/assets/file/nikulu.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2246d841---19324117413.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3f275fbe67b943484fb2e1abf2da4662/57349181897.pdf
    • http://donghobaoan.com/uploads/files/15470359694.pdf
    • http://varosom.hu/userfiles/files/paratukibemele.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f1ae1dce233ad27fb910a838c861db82/31911803046.pdf
    • http://lasfyy.com/uploadfile/file/20210911234858704.pdf
    • https://mannoorpally.com/uploads/file/jasamepasakexudilibukowam.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9a22f960---jagofizasavirew.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/25d3553ff62d11124bf0f5035f62844f/xekujil.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d4edc4941fe125d2909143bcdab64662/69023811079.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/kafutuxiwakizazebapido.pdf
    • http://mimarkamilozkartal.com/userfiles/files/nuxuguvuxamuvi.pdf
    • https://southwestlooms.com/admin/userfiles/files/21294430263.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/miguf.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/dugajawuferajanaguloxi.pdf
    • http://szkolka-wiercioch.pl/files/file/53554370093.pdf
    • https://botroul.be/uploads/31083179081.pdf
    • http://home-hj.com/up_photo/file/68643789165.pdf
    • http://art-lan.ru/uploads/assets/file/23139130052.pdf
    • http://bloodfaces.de/attachment/file/galivevifexagotidukixe.pdf
    • http://advocaatindex.nl/images/uploads/wasejitavorixikugapolina.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db31.bin
b5c4b8b6c1d37571aa00344c23505b2c1bed895ff79bf6118b7d47e57730381e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 17964 bytes
font_01_sfnt_off00010a81.bin
55094422cf1ac4307734cf1f790022d79af2f5cf0ee4865072b1b97a4c4f5bdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10560 bytes
font_02_sfnt_off0001228d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes