Malicious PDF — malware analysis report

Static analysis result for SHA-256 e211edc36a4c7425…

MALICIOUS

PDF

85.2 KB Created: 2021-06-27 23:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc4e70909857bc6e72920c56b7fbab46 SHA-1: 51995a5c8646d153941f1527fa02f2f27de956cd SHA-256: e211edc36a4c742561a1ea633d8e5facfa345bffce30a12c79b2c6f7c022642f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://reclameindex.nl/images/uploads/pizuli.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2f176df8a552c3917be76f288bce2e78/89845690441.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/84478936702.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/wisux.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/aaf4a1864a5b13d44f0198076aa546fe/82385626106.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///57836215141.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/magolosadosojo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480bd2f526---famaxuronugi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/33455594937.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/edf99ffea308558adc05b2d7a2613103/foruvetidixumer.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1e66230e4e70cf17008372a4df142a12/29731144619.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/69487650227.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/87fafc15a2c0e1f0e49605bd584d5b79/30320903260.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c11886a4---netozisepozosowejabiwilo.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/tibikovavazukig.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/32572271295.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hbcf4qnkkb3jubi2m3emakuvd1/sejulorevupozubel.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kapotadogalusoxijizimu.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/jufidixilefuxopujoluv.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089359f30a0a---dufitunom.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9af70b30f52496454179aed71f39d096/fukafe.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/80333930545.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0c018496---pabebaxexusadapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+was+unablePDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 9968 bytes
SHA-256: c6fc8e0b1d10f8195eec519acf02565c848e401b9cba2a1b0c11d85a89394aab
font_02_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 22808 bytes
SHA-256: 648bba93f232f606f6f30fbc6b873d702fe6976deef992f52cc02a37e35dbdd4

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