Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c8004fe2241e7e…

MALICIOUS

PDF

81.4 KB Created: 2021-10-09 10:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b66b7bcbba8f4d25552dc5754802329 SHA-1: fcad17185e322eee0ca6b1b2011988917feabe2b SHA-256: c8c8004fe2241e7ec7fe59dc75666f223d88a9cc3a49e9ce18fd3d29b5ac7a1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting an attempt to distribute payloads or conduct phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports the link farm attack pattern.

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://wastran.ru/uplcv?utm_term=atheromatous+meaning+in+tamil PDF link annotation
    • http://fond.ru/userfiles/file/78054734735.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/dujuwew.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/wurudujumugefokusew.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9c37b47b---73931253133.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/kopujovivugidapofuxemez.pdfIn PDF document text
    • https://kultmotor.hu/images/files/68967540626.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/40568340494.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/nivikaxeleledimufuzepot.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/fokasebof.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/nometilaxegozewu.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/17293394722.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/12721007015.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161512974897ea---kifif.pdfIn PDF document text
    • http://excellent-art.com/userfiles/92492848279.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/68007000577.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/12058547179.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a1127bb6dd1ea95051e80713a61c85ff/duwixufuzakufadavame.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/topuduvurim.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/53235900429.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/nejun.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/27594cb6401e00b69f09a3ca6fc41536/13464912960.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/936fdc260aad5dd103afaa31a4ce7c5c/zajezevaredam.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 19524 bytes
SHA-256: 3acc3ed787a1868a445edb381957499a609a62570823bc2c23b9c5be730ac8f1
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 10636 bytes
SHA-256: bb6d27b1b9d917e1ee961ec294cad42ff649fcaaf149506166489e7b3989bd3e
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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