Malicious PDF — malware analysis report

Static analysis result for SHA-256 050ac54e14c033db…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 07:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e54c1ee74550c9a59e74e7a9b7e849a8 SHA-1: 617c0abfa95bf5ff2ecf33da5f666d31c08f5a7a SHA-256: 050ac54e14c033db4de76a421ef2900d4472498c9a6b015d87970b2bff190518
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which are part of link farms hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strong attempt to distribute malicious links. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for further exploitation in PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.jindatunnel.com/up_files/file/91554140207.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312bae0a79f---41984709435.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/22114594516.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/lapig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86bf6f465---39503776616.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109092003415344.pdfIn PDF document text
    • http://www.siposferenc.hu/html/49226586453.pdfIn PDF document text
    • http://riversedgefm.com/files/file/66666721970.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/paniretewezigexerinev.pdfIn PDF document text
    • http://techbis.pl/files/file/40359623446.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/56004153.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131688624573---24786310238.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061002297465.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/risopesoxotopuvebape.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/babuv.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/zevipusis.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f82431302---98930079566.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/25289370622.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/29901029825.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/17254797966.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/88326443711.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/rapijozuwopa.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/zifinojexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=grand+theft+auto+online+pc+free+downloadPDF 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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 17400 bytes
SHA-256: c8c3932e0ef7d127e7649fe9cfdca33bb61327923663590c3e43bb32d3582e31
font_01_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10776 bytes
SHA-256: 5885c5644659495d01cd8a001cfe859e3a22ab0901423436473e3c71179fc9cf

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