Malicious PDF — malware analysis report

Static analysis result for SHA-256 280226c11ba2cc8d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-13 21:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf8a10a6b317bb6bb18824d0f37cca94 SHA-1: 74bd694c90e303500b154729901567b95d532c18 SHA-256: 280226c11ba2cc8dbfe3f9977e66766017d5b4a5d4cd474c630d5272b4337eeb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

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 https://chcial.ru/uplcv?utm_term=can+rabbits+eat+french+beans PDF link annotation
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/48b203e1e06a5bee162829aeeeef8865/tozofepunameloraxijezijoj.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/tikimafe.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/bepirodugaxuwu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/1807066261.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076496d2f608---3030843646.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/16270729139.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0ea0d18d---timixuzebagagabanufa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1dc6df9e12a3d7a994c1b7f6a2e4fcbe/11662954387.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6af11102e363aeeaef69384eab50f27f/35945270561.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/jimokofozadirerof.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xagojotizejexivufimivoz.pdfIn PDF document text
    • http://93564497.com/userfiles/51443809451.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0ddeed63---xikijelufega.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/siwexadotopujumel.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f6a0196e1---32084606765.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/70520579575.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/9615417020.pdfIn PDF document text
    • https://ancoraeducacion.com/images/3846071274.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/minudekek.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e7143645e0990f0ca0fd705701f0b589/20037569042.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/99237526159.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6fabfff23ac907c2472da592e9c77a07/64671800884.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/812be9fb43aac5265cef0e7898939521/zisedorusivipexemije.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/14262932815.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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 17756 bytes
SHA-256: 7dcd043a6c7fbf5400197dc06a737a393949ebc307cf504f33a05d4757fcb4f2
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 10440 bytes
SHA-256: b4c5a2e2d8bf0bba5ef836fa271bfbd2c8c53b27a9b2f24a105e2e80761f92fd