Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c6e31ff5d8c041…

MALICIOUS

PDF

77.5 KB Created: 2021-07-01 00:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 458dd56120fbf21a479e7a303ff3566e SHA-1: 3319659067b196317b5d449e5adc9b025af9e5e0 SHA-256: 97c6e31ff5d8c041b92c1727449a34a4b86027a43ae3fcbb0868e9f70ccab340
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm directing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a2a1771784502f201678e0d164354142/janevepe.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c992327e53c---guwofe.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160974d45cab68---92814664018.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0cad60fd977d15918cab64f450fe5784/jexevomazetelizadugi.pdf
    • http://aliglobshop.com/userfiles/file/pizesiwejafupufovumafewab.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fb2d3aa8---kugopigof.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nadojanepigopa.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e4849d3629edf90a80627619e6d61106/lifurovarotaxakimisuwolox.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160860688a1752---30567133495.pdf
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/zuvex.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/560aa3109e411ccac22d8b7c07228869/depibupadelom.pdf
    • http://bukharaatlanta.com/sites/default/files/file/gepadizolu.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c5c828226---bakubinu.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7viaog384g6a0n4us1rmn462lr/zudabujeruzezukuxasosamu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/m4hj1b72a1brfep53j0j12i8ml/gujulegapavudumojuxanako.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c550ed174a79f0c9a83c3ffa811991a7/95259941196.pdf
    • https://gawwaclsc.com/app/webroot/upload/files/50347725665.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c67fdac9f---50124623137.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jc7nubnj3cl9c66guvdvsnvmqa/28452415536.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa31abed6b---vetiw.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nveim23hab2ig0l48o0g5i6rjp/wefejogeseduzinid.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c16b3bfc---83910870899.pdf
    • http://brandnewgoods.net/userfiles/file/2341950360.pdf
    • https://ivaco.it/file/fezuxupuxe.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84bb37cc3---78285818406.pdf
    • http://roxburyhs1987.com/clients/63080/File/28802426031.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=you+are+the+sunshine+you+make+me+happy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d2.bin
d3c889eea8e7f7e0623189c156125c5334c577d0a0b7dabf9665abffce838466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D2 10760 bytes
font_01_sfnt_off0000db73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
font_02_sfnt_off0000f385.bin
b5b72c86a7308d7190a06c1017e938c0dc370dfe0d2bcf2f41cbf06ee096f458		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 22956 bytes

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