Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8b8d62b31df69f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 11:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 049dd7e85f4e531dc1e65a9af248eef8 SHA-1: d87da16e390a6bba3069562143ff850c3a9f546f SHA-256: ee8b8d62b31df69f23f7df79c4eeeee4bf372849ce7a146ecf0e7cefb3b4d453
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. Heuristics indicate these links are hosted on disposable or compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pixomot.ru/uplcv?utm_term=hoga+toga+screen+wallpaper PDF link annotation
    • http://king-pro.com/userfiles/files/lobesugipisakapuguso.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139525e95f7d---36532373259.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf56c831e1---68983327385.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5eea505ef184770e066c241cef83c081/bepefokozeparu.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/pudowefejeredu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wibejagusifinamel.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/popebiduzanuzikoredaxul.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/93261175647.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lekelakatagukisedalilem.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/47388233096.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/vujurasegon.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/fowakatuzifok.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631039918_f6032fcc5c.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/55464986564.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/3185749738.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/befevefopusapideniv.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/92473556711.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/ponurererixepug.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/kevuvinekimuvirogalarel.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/femebifameforivupavi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/51223074891.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tawezejakopotipulopuxexa.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/85683439007.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/vuvazoxatuxazok.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_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 10532 bytes
SHA-256: a9f5cc46e89fb884cff747814fddeffe75d703bba213355c27134c0349463d85
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 17072 bytes
SHA-256: 7d7fd3a15551f37bc751a6df6995b46bc97ca30e7fb45e8e36761d5f39e223e0

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