Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e431d355e2dc996…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 21:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72722c38fe4e8a0a84cf4a434139ba66 SHA-1: 13e899b8a850be81daa2aca3553e08f187afbd4c SHA-256: 0e431d355e2dc996d524026314c591fd293901abe7fb750ffe6811cccd7c0045
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised websites, disguised as free software downloads. The ML classifier strongly indicates malicious intent. While no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://arch.ua/ckfinder/userfiles/files/pafemexib.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/t7r4rhspdk8ln6kvi2dolpdo9i/dirakapesobovogasogeso.pdfIn PDF document text
    • http://climtech.com/files/files/suvudarimoxup.pdfIn PDF document text
    • http://email-database.info/userfiles/file/wopafopowitapad.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/rotexuwunulijeweb.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b179b5f7---bivojiwefigozanudokape.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/fozolimurixogel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610005a905087---poxisefudoj.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/94296126654.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/94160734107.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/23198937.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/pexisipisiruxelobakemeg.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/livozogaludex.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/zuzijepezupulapebita.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acc97f18e81---lisopunuxivuvuramese.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/wumifunarovug.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1865360073610ff23b7e65b.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e82e4804---25422113382.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ae3e53b625fb23c7a2d42e7a098a6b7b/49919176292.pdfIn PDF document text
    • https://andana.us/files/files/42208935266.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fcdc6a4e055c25c410bb0a1cee5a8602/76988788800.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900d9a6b32b---5494330923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=word+to+pdf+conversion+software+free+downloadPDF 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_off0000c28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28F 10760 bytes
SHA-256: 47ba0414165f7317ef1120cfe81fd65b787f1a478722fd3c42632a5666f7742c
font_01_sfnt_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 17700 bytes
SHA-256: b5cd96b80b053d1bd507c1b0d000d4a254e170a44f2bfeeccaf753d7fc4955c9
font_02_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1