Malicious PDF — malware analysis report

Static analysis result for SHA-256 d714b2fa5bdd1bda…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 07:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d555b05910d02b2aae91fe5a964f10c5 SHA-1: 6b158fca955d3268f5f4d7a39d8ba5a4fdd761fa SHA-256: d714b2fa5bdd1bdaa4f3a1593a620b37925e7c71e9f2cfdd851f9a2a723eb966
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update, which is a common social-engineering technique. The presence of numerous links to potentially compromised websites and disposable hosting further supports this. No scripts were extracted, but the overall structure and heuristics suggest it's designed to lead the user to a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://rezidencianestor.sk/app/webroot/files/ckeditor/files/duzebebapar.pdf In PDF document text
    • http://www.pilartangguh.com/file/53403642684.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f808c46145---41191394051.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/sevuxedilis.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161372e3b74c85---wavilokuzuni.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/mutaluveziginefus.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/jokowoxigi.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/eh03g6bk497vk87hcuclsrb0ke/kewimaroxavijexinejuw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7fd0b592---kogiko.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60915201686.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/tatubazinimefax.pdfIn PDF document text
    • http://devison-matras.com/upload/file/dinokifulov.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gomojat.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/pejewogif.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/33515427185.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wazusokolanukomogaperuk.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/47370272662.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nugedamorasul.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/63719459584.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210906075219.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/janimogeragapefubupor.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/66573537629.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe7f80e1e---gunefifalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=delete+temp+files+on+androidPDF 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_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 19040 bytes
SHA-256: befc78db8a929c39123f43ce2ec8f68de9435a873b938d94225365f814ee14c5
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 10660 bytes
SHA-256: 4b7b32693385e82aa8125501b4e84de476757b0fdd81980ac283557bb1a294ce

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