Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d69fcb987d3dc3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 11:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76d6001ae494ef7b5e67d908b3a5353f SHA-1: e4b737e96f56f47698c7d94db8e2506b83b850cb SHA-256: a8d69fcb987d3dc37bc553c61fcb7f3b81126b1ecdfff7429b0e03c8da48be36
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, designed to lure users into clicking them. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://viadagio.be/userfiles/file/26192973268.pdf In PDF document text
    • http://ivankotov.ru/img/lib/file/sabosalinexujenobawapo.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_44BCC802ABFC97F5.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3d1d2e5---notozavexituluzovusarap.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/28030238c5c41802fbc8a209fd90f3eb/12413850496.pdfIn PDF document text
    • http://servmed.net/userfiles/file/metobuzomuvu.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/tenegoli.pdfIn PDF document text
    • https://bfull.ru/uploads/files/35258158338.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/nuvanurefaxaxejumiza.pdfIn PDF document text
    • https://rosycaffe.com/file/11892122712.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/73459471879.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60acdb1ab---sumevezubenevoj.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178cbc07ec---rarulufon.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5bfa97f01---furuzutarudi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/043c471353cdcd03994d232805a62ff7/jobavudilakadilekuboza.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/norijekijevujumox.pdfIn PDF document text
    • http://www.polni.si/Images/files/rutimexuwonolug.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/xarufosovifewusewiri.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/21315691663.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/16877051187.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/62694906610.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/10080222061.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/puriposumopifirenapaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jurassic+park+full+movie+123moviesPDF link annotation
    • 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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 20552 bytes
SHA-256: f7eb2439ed91df8386a70924f58b43bb01538b89fac4c9e8af25174995950bbc
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 11032 bytes
SHA-256: 47b2e80277af987cb57c508864454cc73c9dd0e11c153316346f3863304b2365

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