Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b508a86735e2d81…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 17:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2659de4e27c2c031a7d48922701011ea SHA-1: a62c20f12d93d489b3efbd44bc7b3625bd166543 SHA-256: 5b508a86735e2d81f2188c46d6b3d596dbfb34411095ab85086aa53d4463a63b
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://packturf.fr/files/xoxubuzup.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdc2f9bd2c---posisomov.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160727ea919613---xumenojufel.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/rilufapowuxegewevefug.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/91471441934.pdfIn PDF document text
    • https://svltv.in/userfiles/files/fekewaxub.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3240559c8e8d29e0b2bf69268bfb9eb5/36515544805.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/53104978374.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/novugatololemosu.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/jokim.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/35642931833.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/93225058396.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/79432455713.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lozumazuxuxowevet.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8235577854---44931648939.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xelevikewajigonuxejogobak.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f7540af69---vupito.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac11fb4015---sufenuxulud.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/51866980539.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/3878935770.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/54524232108.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d243fe35---26928026836.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/2179750343.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/76900410435.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/lijafaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hydraulic+pump+calculations+pdfPDF 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_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10856 bytes
SHA-256: dd6a5de3df1cb68577544519b9d5318df29b1c932970822c945d90ff85e28d8a
font_02_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 17568 bytes
SHA-256: 877048e2777104266ce1c8895c9e798d0ec002040e01c8d4e4e3a715c07f581a