Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e520276a19fc7c1…

MALICIOUS

PDF

93.6 KB Created: 2021-07-02 06:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 64c874e4d30d5067456724ea9f9bdc9b SHA-1: 146194556521e61b002fb7c6d20c8ab54b6829ec SHA-256: 8e520276a19fc7c1b35e0b448e27c137ecc69914ff78cffe523d349faba3858a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p6548801qv5g3chvcjdjhtas7v/53223056882.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e427439c32---fanobesawilanu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/vufukagozabefov.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d1876732300d3fa238d487f9df58c5ec/dukudefiwurodogogev.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89da67b52---voralakaxazaxomete.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/oksf8c80s3a74snt57qifum216/60186510999.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30582fd78---vejoduba.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd652db604---wirevuwigenamibuloke.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/83045834642.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/xepujojulur.pdfIn PDF document text
    • https://areicon.com/images/file/wuzapakefodadigelil.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/938f06cab2f78585fe3d23b79fb21b1b/81449720932.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/2252647768.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3c23f9d7---93616444856.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a185889c9---xupivinadufiboxovetu.pdfIn PDF document text
    • http://feast.to/upd_file/79817764672.pdfIn PDF document text
    • http://rayanchem.com/d/files/dupovu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/govupibexarokazizokabuda.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/32779449058.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/40720057455.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/58514499377.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c4553a8a---divotipukekarikig.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7cb0a5ce---vamuxixitovuta.pdfIn PDF document text
    • http://learningkey.org/userfiles/zipusojemizasonaliwuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+a+manual+in+wordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 17164 bytes
SHA-256: 1396790c50207e056fb88fe1063cdf729fd75ed66c36c8be8a291795abc7e47e
font_01_sfnt_off000137be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BE 10512 bytes
SHA-256: 3f2aa886dde2d2dc8abeb6b03ef3707c3cd5c2f45c3fdae8bad1eddd08793af1
font_02_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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