Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca419e3309a4073…

MALICIOUS

PDF

75.5 KB Created: 2021-09-22 21:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7af101ab69b248644fb5949a22c5b7a6 SHA-1: aced7e369f0f1ce7cde2ab2a15e1a9a1f58c7458 SHA-256: 7ca419e3309a4073dd1ff1ce5fb9fa85139e8a878c50b683f1241e5534d06a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. These links appear to form a link farm designed to redirect users to download sites, such as one advertising 'nba 2k20 apk free download'. The embedded JavaScript likely facilitates the redirection or download process, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=nba+2k20+apk+free+download+full+version PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ff611d1ccc89840e1dd7fb7f654e08d8/66060235320.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/87751588265.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/xokasitif.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/zomunojilujul.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/logewetiza.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/vamatesumikupurumenuku.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/29072292207.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197222342277.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138de57cf624---funinofijifizes.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/pitubinugujusoduvesoliwo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8729b8761---12894941021.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/52424540706.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0b511f4b9ec895e54d80e111638d5e56/linevon.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/83155556912.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/judegirofe.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/fudekirokeruw.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/dekijimajisideru.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/7328589886.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/24237542100.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zesisimowuj.pdfIn PDF document text
    • http://cloverdiamond.com/file/91064834233.pdfIn PDF document text
    • http://asfalon.com/__files/file/80897104587.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/19565551930.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/59395193712.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_off0000c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15A 11096 bytes
SHA-256: 02fa3a9e9bdbb204955b4a33f0c720946110a56ea836c5b8725450a8c3db948b
font_01_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 17236 bytes
SHA-256: dd0fac91c9eac594490a6521acfefe7e92f7dc50b56111ce0b67e0ec464296f3

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