Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9f3178821a25f6…

MALICIOUS

PDF

103.4 KB Created: 2021-07-07 15:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21de3f91eb08588297ff56550289e1e6 SHA-1: d61ea6c864ada11963cd0c47b590bf2149a8c10a SHA-256: 3e9f3178821a25f60bd5de66b884140f7269a913ff7e8280923f1429ea3013ce
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm and impersonates a cloud document lure, encouraging users to click on embedded links. These links point to various PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eurotechcorp.vn/admin/webroot/upload/image/files/solikawewef.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/podike.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8ba2858f---61752192052.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/eiub2q8n2092bqviijatl0tga5/3037892927.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b6a227d2---99458577541.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/6129586241.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830552d63db---97075419025.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/293g9ls16ri9d9enib61t2h7fd/55612954116.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/90085243973.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fekum.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/81209999403.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/805c6760e8b31989bc0c3886e0122e1f/dubutofasebezusejofi.pdfIn PDF document text
    • https://songhong.info/userfiles/file/pisiniwosaxirepoge.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/98327562985.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e31dba51---fibujezovuberej.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/pedivoterefotibog.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/setoletobuvovalezukumeme.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920704cfccb---lebexozemixonu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/50327c76baf14008fb4dc4fbfa0cbbf6/10104606278.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qpm3cmc905t65t7tl819amtejo/43745659425.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/lisin.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uvqv5fv0b2vcbl99lls03sd7lo/nameliped.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160858ed136841---83879788718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+cannot+be+installed+on+this+hard+disk+spacePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335c5657da---sozosepuselulujo.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/44b0edaf491d4c5802a5095213fd494e/sunajelekefa.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_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 17104 bytes
SHA-256: 0404e0a8f189a2d2ba49b521e045a3d72c72e4a6c7328c2c7e915601d73dfd98
font_01_sfnt_off00015ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17707 10920 bytes
SHA-256: 20cb2368e84708c580a15880a7ec0f6a14885ccf10af4a28cf7e1e2d28e4a21a

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