Malicious PDF — malware analysis report

Static analysis result for SHA-256 da61dc4a74634695…

MALICIOUS

PDF

98.1 KB Created: 2021-07-26 10:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb443be080341125a3d98193802535e7 SHA-1: 511d9db38a8b983cedcf7ea1ec29a459cf4ed1d7 SHA-256: da61dc4a746346951d213254b8cadd9c51eb4669cf29094266af2bae56b2e331
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://efnnma.org/files/file/27321167094.pdf In PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/duvezu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/felurowav.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6b41da8da0957d230d9366637b408e42/57664537902.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jagatogesumivovotasutirej.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9b6dab45---85797291745.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/86075200859.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/javoz.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/74764879067.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0865134615---52666111987.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/pakuvasesezepuvawi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9553fef5---70629749401.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/50524377750.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/76221431907.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/xiruzokuxevukibimeware.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/jexozevazejeselelu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4aa6d71b0d56521b3dc25f8a9fc099eb/68216028469.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/21376288155.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13147007671.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/047e8def9299ef059041bca289fd4845/40600750365.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f45128b9a50---rabevufamelisaxakibapiv.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/gikijo.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/260753446269.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/24955368000.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7956c31da---kedigugiwajopexodawavowal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+gta+online+solo+sessionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A4 20300 bytes
SHA-256: e840d40fe08d86ff0e1b7dacde80f0e971458688062bd55f5dd92c86c9deb042
font_02_sfnt_off00014cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB1 10280 bytes
SHA-256: ec2f26c90749f7c76183368af9f0d0dc6ef7a3822ec5b94b1d071cda086bf679
font_03_sfnt_off000163cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CD 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084

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