Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9cf13c09ac3875…

MALICIOUS

PDF

89.3 KB Created: 2021-08-17 08:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c477a47f46070f2a548391426b2e611 SHA-1: 529356f88f1a4414da935692e527846e2adecc1c SHA-256: de9cf13c09ac387513afef00e27828fdaeced7dd377e2c2ea1150e077ded2d1a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or direct users to potentially harmful content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://thedreaminitiative.org/Content/Admin/uploads/files/21119479950.pdf In PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/20376898264.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161121da8f0284---20715328416.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6af584afbce564792b52715e38c0eef1/51047327331.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/70103916786.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3511ae5d28735540c9847c480defc6d9/norojalep.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0u11mf5o3hdp63n0e1o4mqk10o/91052237999.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/82806092337.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a10377c1479fe1edef4021c1d4e6557b/43422181814.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/getujozak.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3d8608e43---8506474762.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/utj1enjrpsc9sdj5pv056gouis/tapatobapupedekizobojadi.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/59058218126.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lebelazoweguwa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/lavagubagutofavomosuxo.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/valasulilixujozaxabitu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/h097jn42fcvd0umgsd48hbsde9/71853918094.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c503eb3698---tivisusenubesovotu.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/90784305894.pdfIn PDF document text
    • http://boldogelet.hu/media/jofokipisawupuzesupekog.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e72d94baeeb---62181344344.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e65e172b4---pefuremegewedegefetukal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=empire+total+war+guide+united+provincesPDF 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_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 11092 bytes
SHA-256: 7153f17320d244fffad3f286e4d42fa879e7de3dc98c8065159b33a8882a2e06
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16888 bytes
SHA-256: a5a21ff935847d93533100f20ca3940c0e289ede2e1ba9fe18f3b49fab7d0523