Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc32aef53a20b8d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 12:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db48ba6f878a460cada4eb566b77f981 SHA-1: c632df2d9f16173c264726c60eabfcfe4e7d3932 SHA-256: 8bc32aef53a20b8d91fab45b3462bdf970407a4708f6279da3a6903ee756b719
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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 https://cursosadistanciayonline.com/medios/files/11904076652.pdf In PDF document text
    • https://dakhoathienhoa.net/images/files/90079558945.pdfIn PDF document text
    • http://annabarons.lv/files/files/5644433458.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/681887256688dc0db84ae15381bb9681/gowezapuvonesoxa.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/72447868751.pdfIn PDF document text
    • http://methese.com/upload/files/lobafajurulufekalupa.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210908071614.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/88788616726.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35401946102.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9153379776142c272eb745.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdfIn PDF document text
    • http://imaginove.eu/data/Files/59422295528.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353dec36193---56127192700.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/14368923489.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/fabazefujikiwabap.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161326f847572a---sifamisukimebosimuzupiri.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/bobowiroxaxekokurakevo.pdfIn PDF document text
    • http://clerus.hu/files/file/23517039569.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/xexililavufopinatunopevi.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/97197127969.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonaligakem.pdfIn PDF document text
    • http://falconltd.pl/cache/file/12845600641.pdfIn PDF document text
    • http://ingore.cn/upload/files/89325985698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+can+we+set+a+song+as+ringtonePDF 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_off0000d1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E1 10436 bytes
SHA-256: 0e47ccf7c4a016e2844fbd083917550975beec7274bf2b5405736c3d9b61147d
font_01_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 16552 bytes
SHA-256: fca027b27f3a08280e2ea26a75040f6c6a71e4ddfc49a02e6b422e17887db202
font_02_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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