Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d9fb9224ef2fdb…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 09:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ba241cec98b9d0d49def024ebaeec82 SHA-1: 0a3028044f7e68ad5b2891a9a9ee6d1d398d9257 SHA-256: 92d9fb9224ef2fdb29ec1f3c74fe605d3cf130c1a8adccfa93fb5ea545d77b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, with several pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://nacituran.com/userfiles/file/78610228859.pdf In PDF document text
    • https://jordan.si/dokumenti/file/mupupagobilotesuranupul.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/26372380538.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/97521431100.pdfIn PDF document text
    • http://getdol.com/page_data/file/tefavix.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/vedazasurojasukemofipez.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16156e7ee0a70b---88116462811.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/kaburudimibasudu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/68930693821.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ace01e4be4---vafawajijonef.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/bapamedegakin.pdfIn PDF document text
    • http://maihome.hu/admin1/file/60948494479.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147becf19c3d---92280688836.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/6417792728.pdfIn PDF document text
    • https://finliz.lt/i/File/vubogaxata.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/suxubaxiganuwap.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/defegid.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nidafulawoveped.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/32868595203.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/313accedb8daae4476c912a3a0c1f136/verolefofarapewir.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/45221807099.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/soresopewubif.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/lulebofuxasub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=where+to+find+redstone+ore+in+minecraftPDF 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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 10688 bytes
SHA-256: dcc5e5292d95acd1be72c6f63a18eec864a5721fecc1ab8d7d6aee2c82f25c86
font_01_sfnt_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 16204 bytes
SHA-256: 62b26799ab28110c4f84f0f10a8cd4ab28fc8bd8bee21a8ed47f8f5e4abb12e0
font_02_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1