Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb26de847a8554a…

MALICIOUS

PDF

96.1 KB Created: 2021-07-22 11:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 520aae5549082925eff6075b40c35e74 SHA-1: a081949bd39e82723e5e49a7aad4aa956540155f SHA-256: efb26de847a8554a83cab78c54f846b829c00e912f6a5e8aa7724192dc40ef54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c4fdd4351e26cd35dd3eac12a1c93824/xigadutenupotovifagizu.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ae848062cebbf3394ea8637534c572b8/65825237566.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/800328445.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2cedbd8ac4995632da2bf9afa6064ab/texegibodikesokoge.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084897fbda59---42156379729.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/2mba7mm4gvki45fo96n3k4h8r3/89802865586.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/xerejov.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210608085753.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/dowujumatogunirotase.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7529f8b6527ca6b8fee352d1e3bce6a5/46308021787.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/fafinoba.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/99972547562.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ba46a1c643575b5935e4769e3cb4dd23/mewatetamajiwa.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609671e38360f---xirab.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/sotejaxixoxodazejis.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/sejis.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f3dbbe3aff52487140637e7935876dec/55653445135.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/sowixigokagolibi.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • https://avela.md/userfiles/file/ferigenoloruten.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zomewedin.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210622224708.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/nuxemopapowoxabixonuw.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a11c8c49e7a2f89737c50d8d833e313b/20642322810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=quoted+and+unquoted+investment+meaningPDF 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_off000114c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C9 17436 bytes
SHA-256: 8d7b86cbfc13dd6f44b8045905ff6544f9a2ed71c33701c3c2e570e429d5d1c0
font_01_sfnt_off0001423c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A53 10816 bytes
SHA-256: e8d0d00bf223a37d72242667cd7f4591668513690a8ea16f4e1182b5c276b8ab