Malicious PDF — malware analysis report

Static analysis result for SHA-256 c517eed24ec1adb6…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 12:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e37a357533b7a545d4e6f240a6766c5 SHA-1: f07d6ae944a737c0817173076b1562e7538d0a57 SHA-256: c517eed24ec1adb61fbc3983675064249ffb66dbf840e644200a28296c739d3d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b51296b73c---63227206768.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a610f2d56ef---jamaxipigalalajozikovisux.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e9d855446bc36ddebe5d14f4dee77e07/bigopisalomik.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f792793d1e---77955955873.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094dab8e4b96---62923895697.pdf
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/wevazigijosakawejeta.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/dowegukazide.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3436131285---21961780252.pdf
    • http://ahkjt.com/upfile/file/domuwutavenijerinegin.pdf
    • https://tedvandergulik.nl/userimages/file/73849410758.pdf
    • http://geometrabottero.it/userfiles/files/kumujerazisibirijebapa.pdf
    • http://skrabl.pl/www/rpbd/fck/file/vuveno.pdf
    • http://agnieszkapawlik.com/userfiles/file/kesixurusojefagiximop.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/rnmpg73vgkoi831bag53n2l6j9/20594571059.pdf
    • http://moristas.com/userfiles/files/xowineregowagudat.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/023357672f554bd6768b1feef96810c7/75071157828.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c932e9d217---71152330327.pdf
    • https://icbacademy.com/upload/files/98418074566.pdf
    • https://maturana.cl/upload/file/46806093108.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160700705bae46---pubezutopil.pdf
    • http://expresskaliski.info/file/85873309789.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=after+we+collided+full+movie+online+123
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c62ce71a---lofiti.pdf
    • 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_off0000eb49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 16792 bytes
font_01_sfnt_off0001035b.bin
5265638176a179e75813487deae7485e01e6e0aee33220ccbeaade649d2596ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 17888 bytes
font_02_sfnt_off0001313f.bin
e7eacf3cca662a0bbfcfc9fd261c5b7186bd6532a61c0e6d52055dc5ec066289
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 10884 bytes