Malicious PDF — malware analysis report

Static analysis result for SHA-256 23447723a073c115…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 23:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd7bd34a41a869ebf06776b169f7eaab SHA-1: bd13a492f9cedbd0cd8c43edd8fac7fdd4c9cf2a SHA-256: 23447723a073c115e984ce93559ca42cadffdfbc7c572f60b2220393c82eb769
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF links to external content hosted on compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.impactit.in/ckfinder/userfiles/files/74587165797.pdf In PDF document text
    • http://kehlux.lu/userfiles/files/kerewoditufeteka.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/41915161004.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/95075976726.pdfIn PDF document text
    • http://khocabien.com/uploads/files/6555249124.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/waxezuraluraridi.pdfIn PDF document text
    • https://mashura.co/userfiles/files/67769046940.pdfIn PDF document text
    • http://vkts.se/userfiles/file/31305939662.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/77969033010.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xegavexolep.pdfIn PDF document text
    • https://ismart99.net/upload/files/parevewokinozupumoxemuki.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/20719773086.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/42488167238.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/5307280616.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/bifewevovexewomo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/fofijas.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a90fb44---34076946730.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceef751d8---bisixiposizefunakulinesi.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/pemek.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109061206421122.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/dazipebaj.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/54425849861.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70008862b---89163079288.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/limunixumubojufikuzevolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=geometry+dash+mod+iosPDF 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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 10516 bytes
SHA-256: 673e3e68e113bfd3ed36ee6062b855ad4a75926bd26460ce7b9d04b7262e3758
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 18620 bytes
SHA-256: 0e805652e844c254b60662dff015e157dee2b48396877dab067611925a2c0ba8

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