Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09f2a4c8284f44a…

MALICIOUS

PDF

83.3 KB Created: 2021-08-23 18:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b79626e1008ce7099d79ea9db8ca5cfa SHA-1: 334db84a62ab11386e71af5d1791827093b71035 SHA-256: b09f2a4c8284f44aa7ab848261a0deb34ac114e038dbc24ef638d0081ba6b25d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://deltools.com/userfiles/file/mupejuxoxemeguridunex.pdf In PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/luzanegusukiradovogupo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592f66f30---22646617328.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/1tdji8uo88elak5ubs2r6t4sb6/tiwenebise.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/jozexa.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a309a324e15---71157246308.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/39953529924.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc73d01de9---xonolepa.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607635c82e2a4---26520164436.pdfIn PDF document text
    • https://loctra.net/userfiles/file/40041898269.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/40ifcqc6hcjb5helfp8rs7u03c/98759186912.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/oeqgc1j56pch3khvhf4fg85mei/jebom.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/zafanut.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zosebomukevujisagigiwu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/14228fb4535cd5d6a68a030065e0d248/92084182883.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85a053a0e---putulabemurutoxa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018854d24d---25763803258.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b1d7c55ed79520e9b1af0663b1df1273/pivareburojuzigunawa.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/doxebasotejoloso.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/40748242926.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/xorigatetesu.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/24103046418.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/38370017115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bioclimatic+green+homePDF 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_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 17576 bytes
SHA-256: 823ae16707ac5ff899604b37aaf0641354ec3fb68a1d7edc63d963c9a49681d7
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 10560 bytes
SHA-256: 18d6e13fcc6f22c71284adbf2838499a5c7c6003829ce3ebc62f02dc00541612

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