Malicious PDF — malware analysis report

Static analysis result for SHA-256 01effee6689e7c85…

MALICIOUS

PDF

79.0 KB Created: 2021-07-07 01:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d2f3d6e27e4d68244460e25aa04163 SHA-1: de1137083a519cea9e91e7b75a24850a5321a26d SHA-256: 01effee6689e7c85b79713daa70503c9887eaca3cf5a839029270ec28adaee4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of URLs, many of which point to potentially compromised WordPress sites. These URLs appear to form a link farm, a common technique used to obscure the final malicious destination or to distribute malware through various compromised hosts. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ne7agpemqom5mdhplfoo6uungh/69962713442.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/q7lmmf3u0mri4qfrr8vr461mck/gutegeganisoxomovarifep.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/fikarerimezupiko.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/74927696484.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/fejojo.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/sonaxizurimubuwabezaralas.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/17686905549.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/velamusebimuvemelis.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/pijidilulabos.pdfIn PDF document text
    • https://puntoagricoltura.it/file/famokodijet.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6409b74352bf96f98a241dc77da98dd1/kekaxatogob.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/46384297770.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943b2ab2df2---lofawulebusujedogolijeb.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/917177f77fc0e153157c7aa61b382602/90007408669.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bubisiteniwevidos.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/64952743371.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b66d31021b---19389609815.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3323b0b902---rizefudikilixutulivuzuw.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070312a205fe---fesup.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/zakatilipibidira.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/83109697553.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ig9g3osh3gn0nutgoq63c54ss5/58645175329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=surface+hardening+of+steelPDF 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 10932 bytes
SHA-256: 24d7562405210ab96d5705d9f69347d0e66845b917f9c2ec6fe4fe7fed153249
font_01_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 17524 bytes
SHA-256: 9cebcf37ee6557392ff2760ce530ee88c3797e7fb8226ec44a2277aa2a08e21b
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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