Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e5003f40e99fb7…

MALICIOUS

PDF

107.9 KB Created: 2021-09-23 12:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5dbbeeea28c6ecc43162df90cf974b26 SHA-1: 3501421e4f0b4dd41d4c110a6b965ca3e8ea48b7 SHA-256: a5e5003f40e99fb7a6b42b5a39f55b5eae5fef47c2891f3dac50e35ca71bca1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://pixomot.ru/uplcv?utm_term=native+camera+app+android PDF link annotation
    • http://lica-mpt.it/userfiles/files/wipitijunage.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/petovibizos.pdfIn PDF document text
    • http://stl-log.com/htdocs/cljr/data/files/fobabobawozuvopisexa.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/seriposut.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/rejumomitewewi.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/1125188808.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/xokizapiw.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/21920406468.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/8057228981.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/31271186174.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/19259681643.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/deravebor.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/18534931883.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51303211272.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa3a741cd---nikej.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a153e107ff---38827937388.pdfIn PDF document text
    • https://ms02bet.com/contents/files/86570991977.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xuwubuvupoze.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90036344993.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/94980698456.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/76300362134.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/mufikozoralojeboregazen.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/58611840727.pdfIn PDF document text
    • https://parfumzone.ro/files/file/23340775.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/41853610473.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8174d8ada5d67708d64ec7a71c60044/94080951546.pdfIn PDF document text
    • http://osayit.com/images/file/59356474243.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_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 18784 bytes
SHA-256: e704a73e1cd02ab963023f86c8a4ad520c07a8b2b416decaa8d768bd1e5e28a0
font_01_sfnt_off000171d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000189e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E8 10504 bytes
SHA-256: 3c9c66bcd04901e38b30a2adf0dbdfada09a2e18e772e0f9e196561125c45563

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