Malicious PDF — malware analysis report

Static analysis result for SHA-256 57536c4dd594cebf…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 12:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8cea8fb6c0b5e4f9f8ca2f0a3bf557a SHA-1: a23b2573b6b8bd0e442794314d86d0d8171e4348 SHA-256: 57536c4dd594cebf7db839ee1cdb5823c602d166e43904ff94abdb17d88bff6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=train+to+busan+streaming+vf PDF link annotation
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130146e0432d---25963879683.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/60301418594.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/beroketi.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/29984363857.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/2307020504.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/matusalixigenopo.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/71234097968.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/24195404997.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jofuforomurirab.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/sosuzibunozugi.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/31874399990.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/17536345134.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/98811602682.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/xomosanabe.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/ragawefijidovapula.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c3568a59e---fujesirofamugenemiv.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/xavipepep.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/49095372208.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad29b86a1c---tuponudorafepeg.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a4c6c108---65751962672.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gosinagul.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/kolefiwatopugobadigakipo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eabb45aa4b---25643170864.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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 17524 bytes
SHA-256: 34a3a99810bb47a49ebaaee17ce13fd081c1f27647c536b02403da87be25c64e
font_01_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 10780 bytes
SHA-256: 12d4b4a069133552866e6bf4af43a6c11d5249d255b20b3c0810ebfa80ee9a38

Open this report in the interactive analyzer, or submit your own file for analysis.