Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12ca51253e1279e…

MALICIOUS

PDF

72.1 KB Created: 2021-08-28 04:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4017f0936d73187bd83a7f134904e0d SHA-1: de6cf2f636fa08f906461099954ad9eb6074f814 SHA-256: c12ca51253e1279ed5dcac510249a9ee11e5b3cb917c3e3dd7e121f52953fa5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=cantonese+to+malay PDF link annotation
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/06g72abalnjftmtaj5n8b46nuo/15882294950.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca6012e02---12495918370.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/xekajipati.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb4a94e51---topomajerajomet.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cc352fd63---tepeporexidisumes.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd8d00101---66378425835.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/4205781122.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebfa568c5---limetozarekisadimoxunuje.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/20077672202.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/tepuredapudisedoviza.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/658e85d5151e2d1b6a01507c72201515/bexenuwapapowap.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f77103624---peviseloruvorudazo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3e722d7908ceb1c9bcb20264b9890fea/sukajek.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/suwugudanenafazaz.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b82025750---zotenupi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090790fbad97---nonal.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e68a0c5d7b9---75314718847.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jaq7d0fs3f2193mslf3a7uu8ks/givuxajetep.pdfIn PDF document text
    • https://777mto.info/contents//files/44873877185.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e1ca982ddcdd291000949dbf84d05b48/rulukaxepodotatogivitewi.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/dinaliwi.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_off0000baeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 10224 bytes
SHA-256: 74366c95e15787f5418c5f3fa2c76003c22ee8abdb3a11084390bb6532ce9bbb
font_02_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 15988 bytes
SHA-256: a0ab557a9a6d5e08a8dfb2c031b24535b9dee56faf21d1057c2f3e398095fc9e

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