Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be9da4a4b1610e7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-07 20:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1baec753613f20f86100ff3f17724fa2 SHA-1: b3adbe3e96b2c3a0b4c6ba372cf2bfaccd1d38b3 SHA-256: 4be9da4a4b1610e72e034c7c52b786e024e5d23d32850200ae6402bc4bd1ea02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://chcial.ru/uplcv?utm_term=kft+report+pdf PDF link annotation
    • http://emailreceptionist.net/userfiles/file/zidawafowiwawekakujepaga.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107271124442864.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/gugolovipojajidelel.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/ranavixodekatijufaj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc912ed5f9d---28642128230.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/58951622222.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/gonaxim.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/gebovolefebobuf.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/e9a87cd2bb51a769354aca8d6e36fe35/2944293494.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0290682fbb---12842968035.pdfIn PDF document text
    • http://3sdent.com/upload/files/betet.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/140904c782811020519867dbb352eb4f/55463066731.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/danugevajamamesefat.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/12917709779.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/temolag.pdfIn PDF document text
    • https://lordoptika.hu/files/files/92076235244.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105181608491534.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/69136739dd1fb7ffb7f37abe2cd08ce8/67568049130.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/34897984155.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d4b864f0d---90389986062.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb562506---vuvejafefene.pdfIn PDF document text
    • http://parentini.it/userfiles/files/bevajixinelusuvavulixurug.pdfIn PDF document text
    • 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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 15840 bytes
SHA-256: 19d8b67e7cf06488cf499a73cc67aef33cb3fad6711800b157be12eedec8a18b
font_01_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 9912 bytes
SHA-256: cb203fbf982646171361241bd720328c44a805a0f81ea255aef073c9d1992b1e