Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c5541adb720a13…

MALICIOUS

PDF

91.7 KB Created: 2021-08-08 21:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9a2394f22a780cea4747a4c747f3311 SHA-1: baaea94fa1c24b8c529eaa5ca7b0f542a62c2ee2 SHA-256: 18c5541adb720a138b248ac531bfcf6532e66352fd239d781a382cfd13529606
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7e007c85dc0bb9604f665ebb1a649a5/rodadopikanatu.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2de9f8c0---gawojadazimularikalodo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faacc3998df---kinaxoweravu.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/ferabesukofaniba.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/1113592918.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/kofaledelegopapi.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b131a3372b6---xokiromiguga.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b723d813bfe8646ff7e8781ee9b7fd1/56744927597.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/nisewavonamiboso.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/fajine.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe98c156f---74950015076.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/64416353915.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e08bda0aaa---wexijezidabesenafemoj.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/fisotuwixumiji.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/65436252995.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/69974602818.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/zizalu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/36971797358.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/48366141336.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2136a1671---rapobivuxeso.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/36286622073.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773d1d43c37---wizopaniwibiza.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/58364107601.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/sefewitofemozotamubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=different+types+of+candlesticks+forexPDF 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_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 10920 bytes
SHA-256: 523f802f148a5b78a8c387638e78f118e184db5e3b8747b315c20e56e50228b4
font_01_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16976 bytes
SHA-256: 323e86c4e1a2e7333479c7408aadcfa52fd0fefd7524e4af3052ed137dcbdada
font_02_sfnt_off00014826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1