Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce78f9ab3fb4cba…

MALICIOUS

PDF

74.2 KB Created: 2021-08-30 03:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 467ad7bfd077e6add9059fc1f2afe90f SHA-1: 13bee79f7f143f11905ec7ac14ab60594e337f24 SHA-256: 4ce78f9ab3fb4cba50f7ff32f6937c574c509ec49c4f1e2bf912a5c70e162580
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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 http://allnatureint.com/userfiles/file/kurajovopemugo.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/20416976128.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607045504b74b---vasibalojibogotulipaxu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/37332778489.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/84577296321.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b278afcddb917b2c3430d7dbe2a45619/72490237619.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/48968772177.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/lifegamutotifurotam.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/13041278034637ca660271be8353d40e/17322017780.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qvac7o9qur6pbvihmthp9qe8p5/44912845886.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/naxomulejuxazi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7847fc77cb---litatetatubo.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/89276953412.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/bisigusenavizefetad.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ee3d5c81f5b438588aa4b4a5447d8d11/68733602968.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/6092587184.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/ridemisif.pdfIn PDF document text
    • http://szm.hu/userfiles/file/jogev.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bf7af3a49181e54adc45af8a2f67bffb/jomevonodizozovidi.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/vugumefalapaza.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14300048103.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/52022827080.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/mosepoliwekazorakijuvo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4822a1f37---vuropakupekexoxipokukuzem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sharp+middle+back+pain+when+breathingPDF 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_off0000c059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC059 11064 bytes
SHA-256: bce72f629a19833bfb62b7f1160f8c699f5a107a22684d240653befa6702f661
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16108 bytes
SHA-256: 5f218884bd2d6b100c3bfd43b3657ec370af4569e1983031aa38ef71579fa7a2
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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