Malicious PDF — malware analysis report

Static analysis result for SHA-256 519ee19d0464dc93…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 13:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2d17305d21216b95db515a409355243 SHA-1: 1cf12a59a6328770b73c1411c3ac339ae0954dc3 SHA-256: 519ee19d0464dc933a447856e1e494f0709ddf25d925cfac883672d517ae5357
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of a link farm on disposable hosting and the use of compromised CMS uploads are common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tramtron.vn/uploads/files/files/30774095219.pdf In PDF document text
    • http://exhibitionchannel.com/upload/60875043827.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/7022402179.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b67e7a0106cdfb079f91c7e08bcc407e/buguwarowepulisedubiduk.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e08cda5c8c4---76385989806.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/45016040470.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab359f6d3---bedumogodezerakinobegawo.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81bc309618f8dd8e17f94b325e57eeaf/18029780904.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/10329354687.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/63314546474.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/wiludufiz.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/datesejefimem.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/aol8tq6r8715oh4hlisvcn3r50/wimavomoruwuburobazaza.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/77221677902.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/78598482715.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd26f8d2f1---82527071010.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bqo79lk3aq4mcj8qmhb66luhl0/midekixoremaforivav.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/95142553763.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/45b581c79396232d19c6b06aeed31a63/8439252870.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/netuxufemilubosemuvevip.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105091029252754.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d927bb88a7d---zowum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=common+logarithm+and+antilogarithm+table+pdfPDF 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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 18348 bytes
SHA-256: d2d980846da93f73096e63d6d5c62b8cf7d451e50e862c0937141eb87616aa66
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 10948 bytes
SHA-256: d5c9bbd131864138379a1acb41c2e56a80cff3adc48ae8885ca10d469c940465

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