Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae3c99f039bd62a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 05:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3524810b268cfe37b45157d8a54651c8 SHA-1: 5a850e1214a4b25d7737b6fdac9c97451b97b025 SHA-256: 6ae3c99f039bd62ac030b3ae7bba41296cdb09e2e905a181941fd026108f366f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to compromised websites, suggesting an attempt to trick the user into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=windows+7+manual+update+2017 PDF link annotation
    • http://aodaiminhhanh.com/app/webroot/uploads/files/73023992150.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/bafiredunejovur.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/33826271884.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/15ccb6a34d51b73c3634d77c355f03ef/29839866664.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a16ba5f877d2064a91edee8822110bc1/50733650258.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/vopedanofetusada.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608111024606d---60157275618.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vg0seatudbufncfn620bifg0q7/98873808941.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072449b0f99d---mukog.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/rn2g2utlcap63tji30d50hev2l/kojixegaluzefaletijef.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d99a63186---kiketiduv.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/42930834326.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/28344923998.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/puxaxum.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/rpif8oj9p4b0umtlmi7040hvuq/61661077707.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/91540559386.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/zunumus.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7deba25c2ff5415fe504744c4c88b0a9/zubuwepadu.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/56680185336.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF20 10976 bytes
SHA-256: fa1009ccc7280d66086084bfda1f53f6a2f81cc540c649ee8f3d8e831638ea6e
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17236 bytes
SHA-256: f52231ab2e72189634ff9099ea47700ab56dbe84bdb1c8d2f89efca302abcca4

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