Malicious PDF — malware analysis report

Static analysis result for SHA-256 def8d59936ace4e9…

MALICIOUS

PDF

68.1 KB Created: 2021-05-30 06:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3026395f3159ae7100b9b8dc150e8a8 SHA-1: 210cc979a4e39a572aa756130682574036844258 SHA-256: def8d59936ace4e95bf708a79415c06b44e35ab286b2eea2989fd3c6ecfff8a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078291534949---77447348924.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608583154f64f---2770682962.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d94a8a573573dcd5fcdcf33fbdaa1e14/vudinorak.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d37aa803a---47913561757.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/dof8ld392dpibs4o2nd2g5qhe2/jatenobiravukides.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a725bc9bb---31598715098.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069b2c92b0---97211801244.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ev7o6nuidi0omp4bhn9btlgc7f/xusakitujesatad.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/08c21890aa464d57937961719c191b7d/zakabelobobuviwe.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b3421476acf2c84d52a18a55a984c668/66122692403.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085c742bc2a2---dudedidebowumo.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983e3acd6bc---fugitul.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/968f5bd6751e3ecfc0a19a859bfa46ee/66018485146.pdf
    • http://bigband-ulm.de/userfiles/files/48262643153.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f022617cd1200f23738d8b5792ab8dc6/72444971305.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+big+is+a+1%252F32+scale+car
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e050.bin
7a9a943c34e66b566c0715b82626c2ca4f4db27f1ceb2e6d75e9e990aff026fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 5544 bytes
font_01_sfnt_off0000f365.bin
a28dd2e556600073b69cbb179ef39644c113f1b9d1732feb14658fb4ba6eca79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10420 bytes

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