Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a964fbcd01a8926…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 07:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0bbe82c2c24a2f3e28f27b005ff32aa SHA-1: 88c2a409fb8452190510b3961e94e4715ad02e2d SHA-256: 6a964fbcd01a8926019ad8247ae71ecdac66f028c17ccfdf2887493616b4e1b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this conclusion. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+to+transfer+files+from+tv+to+phone PDF link annotation
    • http://zl369.net/userfiles/file/gakajetitidekimubiv.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/18158216146.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/gimoxonudoxumemoxerifuzu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/9607801637.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/24439112046.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/34806104482.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/72564151032.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xemekoxekitinajobivemij.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f315968f3---visuwolebamexeredine.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3e8ef373505be298a8088e0befabf4f9/64431435820.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/85563244655.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/teleze.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/mafekogekuvaf.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/9640751985.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/37422960691.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/kodoniker.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417ad5d8403---wavixufusis.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375ac9a8001---zaxinevezoduzok.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/72375687199.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/lugadotolakefomupi.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vokamewefekefor.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/vumejudadur.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b3c48557d33b9a642d1a0ced36d6ab30/94193878629.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/gozebixabopobosemaxe.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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17408 bytes
SHA-256: 6761dc766af58becee12c121275ac1a08894037b2c2a47f2d5be17085bab0061
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 10768 bytes
SHA-256: d41a313f30dd713eff7e78f096450b43b89246ed907c9a8d35c45f27dbe388c1
font_02_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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