Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2cc8772caa3d49…

MALICIOUS

PDF

79.2 KB Created: 2021-10-24 01:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8b3c39cc0cc7cba7379cf74f9de209f1 SHA-1: 27e2692002d4758b63d24fc14e12359883c728de SHA-256: 5a2cc8772caa3d496c351a5a74d3b65fff7a91c2632b52606f382a3b9ef8c9f1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, 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 presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=revised+mastering+the+fce+examination+teacher%27s+book+pdf PDF link annotation
    • https://mobilaide.com/upload/editor/file/nulesuwisud.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210922142916.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/26372518081.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616cb6b3af913---sulobudusivefowigidowogu.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/dajajorizomijubeja.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/biwugisunasud.pdfIn PDF document text
    • http://cold.lt/userfiles/file/82115060416.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/11119404540.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/56525944133.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/36118561122.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ae5d47b614---5689552116.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/ronimexasavatanod.pdfIn PDF document text
    • http://greenglobepms.com/uploads/18332138489.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/nitivasen.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/21141843880.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/febotibuledefon.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/21436945307.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/gutuwumakubozug.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/14649733892.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/sajasaxabefi.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/petakozenidagalamizo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613912326e1b2---wimiwamikeribeve.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/52017190900.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/dagedumovamuzudot.pdfIn PDF document text
    • 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_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 11500 bytes
SHA-256: 31b9e45e8b2604f0c30548ca28f8d0dcd35c59fa4e33c30767d716517bd4df73
font_02_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 18124 bytes
SHA-256: 2bc536351bdde71e988f855b8b32ff2055ec602ee3497f6ef7464cae95d4bd43