Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c210813d6465a8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 13:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb550215f6fe7414fa908e2a07052730 SHA-1: 0be06551f4f6c39a54d124d61d9c70afea8cf7d1 SHA-256: 65c210813d6465a863a0df6a969900b2cc0d5c74e2b1fa9b78966a966f54b5a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating a redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=neffex+grateful+song+download+mp4 PDF link annotation
    • http://tavaszitura.eu/userfiles/files/7293821602.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/59828564807.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/83814033707.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4d16aace---wadodiminir.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec24a0cb5---pabovil.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rejineburep.pdfIn PDF document text
    • https://fultoys.com/userfiles/71435562703.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/bixomamogasikijateti.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/mokuwizizi.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/42653175497.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/foxofadi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/822443c8e8a122cc02e6694b1e5d2929/31291424226.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/75015896374.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/tusosezuvipopozosud.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/82998798594.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/toladorikamurepiwizaxula.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090420302945.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/soveporuzura.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jijutebuz.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/12711184827.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d2a230df87d8ae8af0e82f426ef0273f/96558996653.pdfIn PDF document text
    • http://iphysiology.ru/upload/69252583958.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/46361210189.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_off0000c721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC721 11092 bytes
SHA-256: 6aee57228616920ed443dd4fbbc5083c0527fcfd13f0921a0d628cec308cdedb
font_01_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 17608 bytes
SHA-256: 0b98f2397c5779ebee03a24826afb3e7f65134f7fa730a3778f6851facca1101