Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b94565e463170a…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 04:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d6603a8541edd1f1416eebd391627a8 SHA-1: 7629e88ad30bfb0208db7343214e14500b06ba29 SHA-256: 66b94565e463170ac54891c997e960d1f7f988d84fed6dd89bbcaad13365a572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The primary attack pattern involves directing users to potentially malicious websites hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=dengue+and+typhoid+together
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/e648c022e92d33d5d0608ac5005c67bd/fegenimoderegiwefonex.pdf
    • http://sattamatkapatti.com/userfiles/file/susilejawal.pdf
    • https://paklya.su/design/img/upload/file/naxopefiwovilifema.pdf
    • http://jrpst.pl/userfiles/file/99866946837.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/fa0403d9290299d2c10cce225ca85cdd/mariketowuv.pdf
    • http://ztkammer.at/uploads/file/tubanudepofoxis.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffa1847e3---nifivamixomaribemoluru.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0b5fb4aa6a0be481e79389b23683da03/dizusuvewupuxaguver.pdf
    • http://rehahomecare.com/upload/editor/files/fopofipif.pdf
    • http://wawabed.pl/uploads/userfiles/file/wexoduzore.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3cg5k2d40liptkck7fpdbta8b3/tizixexilosunemad.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/7b1873deb537e5327891ac55b43d92be/74574538627.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/80617e8ae25da17d8d93732524a4b0dc/12628208067.pdf
    • http://canhtoanland.com/upload/files/vodudaxedivuxe.pdf
    • http://dzbnf.com/upload/file///satubobadozenavozijevosol.pdf
    • http://aylincinarli.com/fckfiles/file/52097898706.pdf
    • http://abpaluso.com/upload/file/bewamewozar.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e1b8e9652a0e570114c6f2cc48a0bd7d/melofenalufawabepaxo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6e27b3de---mekavosijotexasuwizidulad.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce68766823a---larosoxidafonul.pdf
    • http://bitite.lv/media/txt/122/file/kovezoxitura.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607201f05c5bf---xeroxitip.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5aa866cef---99306035166.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724781a9d37---puvaregupenuduvil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee60.bin
9e159c2ce500b00fe5eddfea2a8496e05fd26eaea0ad1dc06190ba714c9263d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10672 bytes
font_01_sfnt_off00010693.bin
850e088167fc6cc1d218a16cad99742f3cd0f0b46a2398ac146c61a15439a5e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 17388 bytes
font_02_sfnt_off00013437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 16792 bytes