Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1dc3fb9070cc92…

MALICIOUS

PDF

77.3 KB Created: 2021-07-04 05:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a6b32661c60cd97888600e3cf64c0e13 SHA-1: 55fd1e127c4560b1f05909a15a59ab894feffdc6 SHA-256: 4a1dc3fb9070cc92fd952e36aa66d438342c1955beabf3913f21453ce3abc9ab
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and other potentially untrustworthy domains. The presence of numerous external URIs and link farm indicators suggests the document is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://eventaipei.com/upload/files/85433962520.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/78b40c752b6f47d39fdb9ffaf29cb859/66859027760.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/11658219426.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928e03c7fef---jubiwajusugoribakiz.pdfIn PDF document text
    • https://istanajp.com/contents//files/relojafob.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e68d5c9c33b3350f8de21eb06e1d687f/juperuzipuxibumuwadap.pdfIn PDF document text
    • https://angkalaris.com/contents//files/59259506381.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/39339426284.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jawifimilirozifojimu.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/85288148005.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8803777f4b---jegas.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/semapof.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/bb41d0f9ba67b07b78e75eac4855796b/38162559253.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/ganizarapigedezuxi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/19578114475.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/30vt54du2793etlber2rhjhjh2/95315188103.pdfIn PDF document text
    • http://hifimarkt.org/kunden/kronhardt/ckfinder/userfiles/files/21790249123.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbe377c4f14e02d640c4e19a31ee2de6/kemewiz.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9d9e434fdc5f6dca80fe3e119d983611/13420353826.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/sixof.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9e9a8a6ea---15024122927.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34d91afd5---16304511997.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/sawodefu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4baae598b---42564114222.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd62aa0562---vituxevukukir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=class+11+notes+chemistry+pdfPDF 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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 11084 bytes
SHA-256: bf744246fbbc49db785bee5bf0bfe5d9928e69efa787e424b120aaa6afc55652
font_02_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16140 bytes
SHA-256: bdd870ad07d1506454ac04a243bc12bca8000e6bf48b6ada1edcea50f795c723

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