Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53db06fbe949f8b…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 14:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3ca17b6adf7c6ca644a3736e1e7cd8ab SHA-1: fffc66aeacf5ce42077d85f274e9a64a22987953 SHA-256: a53db06fbe949f8b1e78859d85961a7f3c512a8e93a6bbd1bf0a0f8a1ef220ea
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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://www.jacenter.org/js/ckfinder/userfiles/files/3490746301.pdf In PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/94841464645.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/cc20d6610330fe66f7568a514130165b/78536234024.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/32544e110d62b9008bb985f07f2bf948/7600253189.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2581f6b2---45241148364.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kokavofipabezinepufivezaf.pdfIn PDF document text
    • http://chineseclothingonline.net/File/sujozesixoxukem.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1a19839e---jusapubuteron.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/gexazarez.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59993470665.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/25902332463.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9b4f1aef---digogotesogip.pdfIn PDF document text
    • http://vo23.ru/upload/file/diramos.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825f5db8211---75431673587.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8503a8701c387b42bc05bf45417e563e/75241837570.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/muzimetokowulagakaj.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/31510797403.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/78076598409.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/42149231780.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/72019991223.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab8a9868d---pilagimovudezunasekexi.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/81546743890.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/fexeravif.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/51843290127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=30+days+of+gratitude+prayer+guide+crosswalkPDF 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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 16456 bytes
SHA-256: 9afbbd786e263adf027dc72eb69fd50e246d94372372c0c9a81ac1ed1440d832
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 11280 bytes
SHA-256: c7b379d0fffc096c53f1c0814fe1e547e2eab546143e4a2160f5a504d41a574a

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