Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8ecc4949298990…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 18:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1821c9d9a244ade9f5c818cafebf593 SHA-1: 1a0d478608b1b9b89a1d51b770fc6101d3f3d98a SHA-256: ba8ecc494929899020f77b0e1bc8c48d841e9b8ab5be481c654b90bcbb91e6ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bruceleevideos.org/images/file/rizenevewokuko.pdf In PDF document text
    • https://5of7edwardstreet.com/assets/media/files/witipubavisanuvoxa.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/30569928446.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/wazunolulifosis.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/webunimexevevutuvonov.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/vuzurokevovazixigujaxuvu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/feruxoxidolaxilogeve.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/muwukovixikewan.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/lewapudiwowigozalonar.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dojizet.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/41079507505.pdfIn PDF document text
    • http://arucax.am/user_images/file/64750578261.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/32c231669ff3ee98fd4eb01a2ad60198/91060609206.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/72501664230.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/19593799816.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ededbd0cc---meluvutamobesoz.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/mamivuxalun.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/72789135067.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/41463348302.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8d539fe7f24ea1f321bfbb593dee2c28/82092154551.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/degejagigukisedi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47877817366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+find+my+clipboard+on+this+phonePDF 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_off0000b63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4E 15400 bytes
SHA-256: 11ab6743abf754c0eaa17a97dbb7a4e15a5d4e945b049f19bb250ca1b6287192
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11216 bytes
SHA-256: 5453d7c91643579cac22ee15883128a90c906cccca6d1fd23a2b63d9acab5612