Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e200f3cd00f478…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 14:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f004c0c3ae3b18aec119d6c0a634152b SHA-1: f08f1d4fde6e781a88a2f0a2bd71621181cbca76 SHA-256: 52e200f3cd00f478d2cd37a20c3e0068cdbad7ef1495acecaffe79b3b2dd8c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://stphilomenaonline.org/userfiles/file/dufobasivuwuvasatu.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/gaxix.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ce7e4c1db7718633afc7558697a228a8/97299448847.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/22789908047.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/79569973634.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1302e28cb2---jefala.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/vuvotuxo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f85f3693fc---16901904562.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/sexezonakewa.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/40629541231.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799307e7ce8---19430875860.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/47697304906.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/834eabbd2c8e9d658308cca9951bd39f/99205390531.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/80550708123.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/66871265370.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/87072814830.pdfIn PDF document text
    • http://castel.lu/userfiles/files/najudegokejijumufaku.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ghalqi53rgb394stgr6l374u4o/5621536858.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/dee0c8f1d71fbc59ac7b73e691f406c8/66997086253.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/narinedebosajefomose.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0b199d23---geziwekenugegis.pdfIn PDF document text
    • http://whatdwellswithin.com/file/megawonenepalasosi.pdfIn PDF document text
    • http://anm-av.de/uploads/files/pililimuxatunivomet.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d82c860c---sowugiwufozu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/80a951cc7c2bd6cf242df9c88b4153f4/vuxizep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nor+i+didPDF 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_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 20044 bytes
SHA-256: 83489376a654fad0c832c506dcde48d2c8c341e8ec9de27293598d24944dc50b
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 9508 bytes
SHA-256: ef4e5aaa474ca6f8d21a0d2ccf5a3f8c6dd0da91ce4765a0f75f6cb835e4ed58
font_02_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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