Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47d9bcfe9f43ed5…

MALICIOUS

PDF

77.2 KB Created: 2021-10-07 13:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad93329e054e4c0e6601e86ac1c69589 SHA-1: 6abd34213a4255eba6a680aebf65d3b8fdbf3a66 SHA-256: c47d9bcfe9f43ed554ffedd91e9689bb41667e968be0bb5b10e8ca6d3e416316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. ClamAV and ML classifiers confirm the malicious nature of the PDF, with one detection specifically naming it as 'Pdf.Phishing.Trojan'. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=worksheet+on+separation+of+substances+class+6 PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1b7c1bb49---72047909290.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/98908678928.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/1265261617.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/52325013211.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/felinesasegaxigimezozo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/75a4dac2909a445f766afaa6ce28f2bd/45930940201.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/78025512891.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/2989638503.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/jedibimigok.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1344c130---nalibaximoberavak.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/6619430230.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/17800462687.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/falananemokotowatusikuwu.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://kvrhousing.com/uploads/34667830226.pdfIn PDF document text
    • http://519pf.com/userfiles/files/porodorejilodapopixewanim.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/sowugajepajesofufikupit.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/zafeve.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161499e0e28ad9---97869972263.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/kivulivawefajed.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/pipoluwulome.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/86327219f503bcff1ad975a37f7e55dc/loxewugemure.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/92687400591.pdfIn PDF document text
    • http://ausafe.net/images/art/files/29861453895.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_off0000c600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 18392 bytes
SHA-256: bb39ddd9f1f5a2986fbfdea27b97c8abe8f419582dd58100a1e40a7f7092c948
font_02_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 11072 bytes
SHA-256: f3c848ad3cc2db165d76bc9bacdcbe4497c8fa5b81fd58d7cb2317c4c0d5e8b1