Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74bfc2ad31967fc…

MALICIOUS

PDF

78.0 KB Created: 2021-07-09 07:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 212ca0af07dbe800154817402c38f7bf SHA-1: 823a35d11220f72c43302141eb84008d6412d0f6 SHA-256: e74bfc2ad31967fc1b205b70f2b4c2f3da5a79591b1406195091f2695b5cb545
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to WordPress upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b257ab962---kirinojarewoba.pdf
    • http://tortsurprise.ru/upload/redactor/files/90527963831.pdf
    • http://mosvag.ru/img/lib/file/vizikofofetoxolewaxexox.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097aed6b3888---66141472684.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae40ec88a---77900244747.pdf
    • https://indolabtek.com/Uploads/userfiles/files/xotilil.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/45im0cpisngbulpff2ga8tc4e5/23556194508.pdf
    • http://lyzebrno.cz/userfiles/file/719895243.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d102da5d1---gimugofovovisi.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7f564b1bd---10793050995.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81feeec2f3---37367417354.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9324b4543---66523687517.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77bdb5cafa---27526314850.pdf
    • http://oprfhs70.com/clients/879438/File/83604022603.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66bca5b911---vonowesub.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77eb6d25e9---pigijinovajemipusi.pdf
    • http://siembra.me/uploads/files/23343849682.pdf
    • http://mulroyenvironmental.ie/userfiles/file/sakipilarid.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c00c5b3511f---95207910561.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cf2d0b63b---56746852413.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd17e998---mubuzilozegix.pdf
    • http://bvsaigonbinhduong.com/uploads/files/ranulafobexakasuwunepaso.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=this+magic+moment+lyrics+jay+and+the+american
    • 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_off0000c8ac.bin
f35756d14e8986a6821bde8e7ab7e335ef5b7072d6b157c6c0def0681563a501
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 17640 bytes
font_01_sfnt_off0000f785.bin
240d2c1c435b597a1d1e22a190b86810d0f4d1849b1e4febc65d8ad6fdede713
pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 11024 bytes
font_02_sfnt_off000110c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 16792 bytes