Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd175ba74c98246…

MALICIOUS

PDF

71.9 KB Created: 2021-05-01 07:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ddff64f0a1f1d3df1937d55f53ef35f SHA-1: 6be15c8163111444ad729d3beaeab9674563b8e2 SHA-256: 4cd175ba74c982466e01f288853e3261be54b1ed6361044c1d33c17f00c45332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.advokat.com/app/webroot/img/fck/file/tebodipon.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ae0d1c40c1f9d0744a7f004e5685ccd4/fabapuvu.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2arpnlkijgsplnd3jma5ghk1ef/pazosi.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fe1ghd0rrahuj7kc8rp8lh60a0/80415034198.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607156b6e30e9---76528705111.pdf
    • http://airconbank.com/upload/fckeditor/file/71020428018.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0372096eb---94071933753.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863fb33d71---69512717175.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8bbefc2c---53282583422.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608023813454d---pefadunatezofe.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ca2f52722c522d0c25fcf3b49daa5dd7/teturiwumokam.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4fb3521d4d6e7cb7865ae531c0c96794/11537314996.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b0ab451ea03a3f3aa01c546af6f52ec1/70522317916.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3ece2ee4---72919458553.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/6d930d14b695fdf62511d1bed3637e50/94975049973.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3f587c1d---jategesidakuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+browser+with+built+in+vpn
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbf.bin
6942b7cbc47eb7d4a823e39d09502b5cd4a9531e39ba6531cd639d41afa74341		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 5116 bytes
font_01_sfnt_off0000ee34.bin
8e224ed8122fd9510dfb9daaefa8d1b95389c6bc7be8158746070620f23576eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10708 bytes

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