Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd41e2a2ad0215…

MALICIOUS

PDF

76.4 KB Created: 2021-08-16 00:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 60cdb87fd1071d89e442fbfa06c850f4 SHA-1: 88b74cc447390f55b310429267f9e164c65fa451 SHA-256: 8efd41e2a2ad021566cd9dc3769b883f961edef0d35cac7e8ccbc57e53bdd211
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The presence of a 'Password-protected archive lure' heuristic suggests the PDF itself may not contain the final payload but instructs the user on how to access it, likely after it has bypassed initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/60179943662.pdf In PDF document text
    • http://finalstage.biz/js/upload/files/wepulikojevodoziwogas.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/guvasoxemovuwejafetitexug.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/656907b5dce063a58e88063a4598cbe0/110278466.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/dawadegix.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/91799061461.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/mejusebikedawerata.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/73670867326.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/66903016339.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a7585cb05---bibexivodagipuxufoteri.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/wipetiles.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d82c61b1b5e---zoxoxekorokok.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4a75439f0ecf9b3576b274112191b21c/siripexinadubijulofim.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/80304140841.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/nofomesadem.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fc0d9f1e---dolukovinevipikabexodovug.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/zuvoxaravonedexex.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/wivekezoj.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34edc1f366---83786284058.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/95384057615.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/57634580343.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210710082423_zc28g4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ejercicios+de+formacion+civica+y+etica+5+gradoPDF 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_off0000c213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC213 18496 bytes
SHA-256: 596276953657327608bd6de6cdbbf7eeeb4d5af30d0f50405804f7bfa0eb0fc4
font_01_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 11200 bytes
SHA-256: acb687c5bfe3810876a6ded3fb53eda1db49feb1eced0d36cfa295861f369a71

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