Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fee5ba1524a040…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 13:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8df8106c8a163e622e59ab63c0de7259 SHA-1: ae69c566aa31e38d0ace712f56f11bbf963ca16a SHA-256: b4fee5ba1524a040337b2d46ee58531a2d351dae52b9da375b8926a2b4c45dd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using compromised WordPress uploads for hosting malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://biaikatolikus.hu/files/file/66641979241.pdf In PDF document text
    • http://dichvuwebsites.com/media/ftp/file/tizoraxoxomo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b96703b3110f29a26e3efb28b8329e16/39764773019.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210524032406_381920575.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37723350e---30418985070.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9927eb33---ligesirusobepuzinasegumoj.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/lopipugovatefizafe.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/82880088416.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/69098689145.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/daxulipebuvut.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/derojozapivobirekemulire.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/62592457535.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/regovugarirewoxokuba.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/5f62202a7f38749ca652ed7accd0aa6d/rimadixoxinal.pdfIn PDF document text
    • http://msiutilities.biz/documents/53527956548.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/woletekiruzoworonaku.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b662bea09d591ee0aa8f87281e315a16/19546169752.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/kusoxisisino.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/73246821506.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/vezavunadafaxuzarigapufe.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6c3esnilmo07os2p8anvamuh5r/82121323999.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kilos.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/venuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=65+bpsc+question+paper+2019+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_off0000c2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 11620 bytes
SHA-256: 342c8ad9676334f1ca1a74b8b3dd8ab8d9f2ef01d99315f33f112a3913a9f32b
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 21760 bytes
SHA-256: 229724c66f6b244c6dccbf134db827aa227ff8fd117368c011ef6d92ce2bb4d1

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