Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d657a05a479baa0…

MALICIOUS

PDF

58.5 KB Created: 2021-06-14 15:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd477d71cdd7e5d99b8564d519b2cf9 SHA-1: 77f099203e3e109688d15fc649d171ace3a6f159 SHA-256: 2d657a05a479baa0bf1dae11a0ffab32d25fd1773a2b22bb4fd9d09610e02f49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=american+english+file+3+student+book+pdf+free+download
    • https://aihr-iadh.org/uploads/FCK_files/file/notonuxuduvawe.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f5c58e8f---88813669220.pdf
    • http://arohitourandtravels.com/userfiles/file/kulumowoxafikodunenobeza.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v86rg5g5cncpt0bv58iedtp7h5/60224438866.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0d07560cb5904c53ef35cedbceacb9e6/10375030835.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16085612feea6b---11438089421.pdf
    • https://tonwen.org/userfiles/file/rivunawuluxopilesezobo.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/9dfc75cfa07d4e2340fc787db90b2fad/pavusor.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4d9640b9---73534386834.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/6e49493a65d255152f6c977a68fdb42c/mupizaxutijufumipufi.pdf
    • http://auxerretv.com/content/public/file/12414403801.pdf
    • http://braciszewska-klimek.pl/fck_files/file/25315779118.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p0n0f815h9f236ql8m8c9mu4ts/bifupepo.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/bfdb223c579e777fd62017769845a080/pipamosafuxomumemev.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3e8d1300---80699434208.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22e.bin
ef45b9eb005ff902f91ac16c651fbc794e6b60504f1a209aa208b2c92f289525		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 3980 bytes

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