Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ae7653d40cacfd…

MALICIOUS

PDF

91.6 KB Created: 2021-06-28 15:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2a16aba581b87859ce375db2d3f62120 SHA-1: a7d163a13b53eee146bac61e106820191922f765 SHA-256: c8ae7653d40cacfd642c22b0275d8ba59e6c03fdd6248649870132f4a4376b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF that leverages a link farm to redirect users to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. The primary attack pattern involves luring users with a seemingly legitimate document, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=separation+process+principles+3rd+edition+solution+manual+pdf PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a1dbf5708def1f9205876dcca77200dd/30574970045.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5675b4bf703eb6f4fae5000c05fa817a/79113723806.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/df8cecd957fb18238649114ed49aa434/51545081597.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/risifizibezomuxikowo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96359939d2---bakesotomir.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/13701222984.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/4990365825.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7856023121---punesajidanezepo.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/61824692463.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9f18bf2a5a3b133a9814154b2141779a/pofajuraxarokavemavon.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d8a09376a35eb85a9a0c1aa53c6942e8/1456737526.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ae86fb97801b33aff8851cddf9808416/kuzegedazexoronazugeriloz.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/68156187774.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/076b1a3df7046ad0219f51e33cf84b96/xitalof.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/61736049246.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607208c98830e---39501638005.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160724fab4edb4---dimuzafurifob.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5bca2030d8d55ba03739bae9b7b87712/sosamolito.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/73621860611.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160aa112b4be39---bitoj.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9834299e96---zorubipo.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/19fe41767a1a66cb6a21d08779f562b7/94422151556.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210616_38D4BB4306CBE368.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_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 11128 bytes
SHA-256: 10a9318622c722707d44932cbfda390ed83b9f6742130b56e9d10615f165de1b
font_01_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 17272 bytes
SHA-256: 9efb461a6ff8e700a2882aff00ec82f8bb425f583d7e3d115b15d5b9891ae0b3

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