Malicious PDF — malware analysis report

Static analysis result for SHA-256 36088e3e015d98f1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 00:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e3f3ed60c5d7be379419a6cf6ed5e2f SHA-1: d4962031e4c1a799b4b97b52e05da6ec2818ee1b SHA-256: 36088e3e015d98f1bc0eeb6cf3f16a1ff0e5d23ed5c2d157ae0989e0fee76c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous links on potentially disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dce98048bcfab1512f815d935435759d/tawutupotozi.pdf In PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d45a074b2d7---48306970906.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/3038463639.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/64284462064.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/17988956676.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/pujodabiluno.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/modugofov.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/pudasafanoduvoxamulega.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a346cc7cf73---71409436859.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zesovifidiririv.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/36849286777.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abde6cf3aae---fofewerububodakom.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rojufesewaveluni.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/tukaju.pdfIn PDF document text
    • http://eichler-kammerer.de/73414622150.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/600694222.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/81488307751.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612a070fb1e2b---fonegunopavinupitizavadu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ab9d0115---52981746241.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/gexuxojigevufug.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qevepnfjpmk59clqt4fj8tnd26/31553810239.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/87736930989.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621eee33c---43516931599.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/petimiselagifoxuxaxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=flat+plate+and+flat+slabPDF 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_off0000cbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC5 17928 bytes
SHA-256: dbc93d302a0068d68be2fcd596a3c61d870cde34bfb17eedaa91b489a8e02ec5
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10296 bytes
SHA-256: 08e21cf7435c1a9e42daec6958a7fd276a9cfcec76780772cba00032dc62702e
font_02_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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