Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0c6c93b9ba0d3b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 22:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33750bb4ce3451413c13e4c41e5b9e34 SHA-1: 2c5ea2ab230d65a7cec088087cb0862bcb49808e SHA-256: cb0c6c93b9ba0d3b71e311bd9fca1b497bd91f95267bac494a664517136bfb0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple PDF files hosted on compromised WordPress sites and other disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://ipost.mn/ckfinder/userfiles/files/96278173549.pdf In PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/sewutewiziwefagubinusu.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/wexupik.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/86632265246.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/65941014747.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/diwamaxaf.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/nobinijefimoz.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/xigupumogefeburegeru.pdfIn PDF document text
    • http://rjt1.org/upload/files/81604746513.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/dusemuduxukewewozeleji.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/kisejosukivovujuxafipoz.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kaperitagogenu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/watarakime.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161478f77a6ec7---81329174120.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/serumodujuziluzedovel.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/58579400594.pdfIn PDF document text
    • https://bliznacite.com/files/35387589737.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e557de43fe---vofexekoforon.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614d65226ac9c---97002587226.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/51363187829.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gajeketawigadok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=heart+rate+androidPDF 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_off0000af72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF72 10016 bytes
SHA-256: 2d4eb6aa0a8c6c22a0757ee86611a1dc120936a2466c55b2f090d6137eaebcf0
font_01_sfnt_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 15624 bytes
SHA-256: 989d267fef4a20631fe8f9837938c5a56ded32413b34959e58219b5cdc913575