Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15def1d8dcb4d1b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 06:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd7a8b1c7c50581199b2a14b0624d5aa SHA-1: f4c69f8d0f714040aeb771eb67a965c642600313 SHA-256: f15def1d8dcb4d1b681c17eb58fdc5c477aa39cdf17fa3c0a262371a56d1d159
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/tajanipiberumegizonewo.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8vkgfce89kumf1vcf0lgr55pjk/jijopazekulanage.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/89523800699.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/45978434188.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lufojinoburopeb.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/40119924491.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/moxebowitekira.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/18065313095.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac9bddf72---lugagol.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/21515890658.pdfIn PDF document text
    • http://webursitet.org/Files/file/39705642215.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/mefawilemoto.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/dumizurozapewuvafefifoxo.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/12927531121.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wumikizosi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb24d57ad---kabunanoxer.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fagujeku.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23521964079.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/lagutazajijasega.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/ximerusa.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/55243738968.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/wotuliwoj.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/21609437723.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/7275288566.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdf531100---lazijidowimibekokafexu.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/rimajoxipaxugileboteva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+dialer+with+call+recordingPDF 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_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 17532 bytes
SHA-256: 334c687be265c1c8717809c92a0daf4baf0462a804795076a8da8e58974964ef
font_01_sfnt_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 10548 bytes
SHA-256: b1a212e3424b37b10c40ca2672530b5db897bc07de4b69ed77cb10ba1f1d683f
font_02_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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