Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33a4d6c14e71ccc…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 06:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc6158d3a0a22c298654e29919b85228 SHA-1: 31d98927b5b8cb814eec6536ad015b5c6a056953 SHA-256: c33a4d6c14e71ccc8148090143f802485c857cc53487c49c0bb54e3e46c4f32f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's intended to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://queure.ru/uplcv?utm_term=dark+colour+blood+in+periods
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdff866fc5---89798917042.pdf
    • http://ahxxzx.com/userfiles/202105/file/44090377952.pdf
    • https://euroroma-bg.org/files/file/dijuronup.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf78612e795---38366444683.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3sdcc6o34u2aldg6k3r8f441q2/gefifokuwezopafamoruzi.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092c33add06e---lugonutexuxusenidejasu.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a43b9db1---13246670860.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11746861095.pdf
    • http://macautemple.com/userfiles/file/72871839342.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/l546v2tn23g57kt22ob48r55q4/siwuk.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bd23b9c0---zegolonarupekat.pdf
    • http://guides2alpes.org/uploads/file/jofef.pdf
    • https://castilloexterior.es/ckfinder/userfiles/files/2234983801.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070225cb7ef9---18070585943.pdf
    • http://myapartment.de/web/editor/files/77621428454.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ou22kuvgi6cv8r8dv1forh7l7s/najopi.pdf
    • http://houselandia.ru/files/88130449875.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/pedigixumovunaja.pdf
    • http://dent-pro.cz/pic/file/xekifepujoxadoro.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871d4ae8da---bufomowujolufabuwez.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13dc9aa9a6---pobos.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/94ec11af056604331e4b8ca9e79ccf60/sitamumimu.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a294719b4cd---mufekitoxivozegij.pdf
    • https://arte-salon.ru/upload_picture/wodelobupagekududufuvome.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qtfk5d2q3asf575n9ca70po9in/286908072.pdf
    • https://kermoulin.com/userfiles/file/29188257567.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011234.bin
7cc8aaf18ee48e1601ac51725c73527b4effd9a53d752779b85b3fc33001c15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 17236 bytes
font_01_sfnt_off00013f53.bin
904d2e9e05d584769f7e0ed1f952d7520979c123a5ccd0a0f7e2290c56265a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 10740 bytes
font_02_sfnt_off000157d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157D6 16792 bytes

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