Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9106c840e2a4406…

MALICIOUS

PDF

91.1 KB Created: 2021-08-12 10:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 81c0a4dcad26b333fbd063743409b056 SHA-1: 45eff421557e9bf93440fc9a974ccca497a6bf21 SHA-256: d9106c840e2a4406a75371eb750552bee557fe29509103a5ad52d7a6d1e8fec1
236 Risk Score

Malware Insights

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

This PDF document employs a remote support lure, instructing the user to install or connect with a remote-support tool. It also uses a password-protected archive lure, a common technique to bypass gateway scanning. The document contains numerous links to potentially compromised WordPress sites, suggesting a distribution network for malicious files. While no scripts were directly extracted, the PDF structure and heuristics indicate it's designed to facilitate the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee09e5dfa5---46518640344.pdf In PDF document text
    • http://anaminfo.com/attachfile/file/xawesomarizezup.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb00757d8---kodudusiti.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/80670755296.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/norujatanib.pdfIn PDF document text
    • https://wita.lt/images/files/23345860154.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/7746255251.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/jopodulosebugukudotojizor.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57825125e---runazinusoxetowil.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/52141424987.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zodalawigi.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/cijthgm39e8tl53ilao285niun/61941293592.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/lavujakuture.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/v2d4m2qbqeouc4v2241cq4voph/petunesigalenelaboder.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba932aeefc4---96688675833.pdfIn PDF document text
    • https://matratva.in/userfiles/file/wumamegufamoxogesefimek.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609969da676cb---zifamixagakukupuzox.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/52710167621.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/605c9144cba1b4000691e3bd52f8afd8/joxifesuxerakagisodasora.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/52321590646.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/7110677519.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0a7adbf3b9475b59ed78977bd3aa87cd/sisirite.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/zubaviwiwaxifokejuvit.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/aho9pi4ksqk6b5creb3vqrs1m0/difilozabij.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddd4c703b9---rugomadotusovupawej.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/d5515aada1e62ec2790b92e9fc1be287/kumepilututiwatake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=b%E1%BA%A3n+ghost+win+7+32bit+songngocPDF 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_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10924 bytes
SHA-256: 95edaad0bdb70c58f100aa0d80123c7a508324b85fc70c931cb1936c8a178d8f
font_01_sfnt_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 28668 bytes
SHA-256: c942c925ee1a9dde55b60cd9992169018f87c623fa811b187a9e4d6b1d6774d4
font_02_sfnt_off000146eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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