Malicious PDF — malware analysis report

Static analysis result for SHA-256 9824f5715b835ad8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 03:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4e9aa505a6672316f5f123c04690fe6 SHA-1: cf52265238852f1e16af834710d5192612ccba0c SHA-256: 9824f5715b835ad834e82601d0c7184fe6d80d8b6392534eb98ab70ce9d7a1bd
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It exhibits a 'Browser extension / update installation lure' heuristic, indicating a social-engineering attempt to trick the user into installing malicious software. The embedded JavaScript likely facilitates this by downloading and executing a second-stage payload from one of the numerous linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • 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 http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/modoxomafizabikolatez.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3e6he76im6e47a26j956hnks7l/mamawitawivetifepovigi.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091048027329.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/wuxazemeropawosoz.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/4243603441.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/52146876360.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nenep.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f287e37963---foxubomikex.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/fukasidimojozexetoru.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161397ff35cfbd---35404593890.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-09-10-18-21.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/nazefe.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/26382243418.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/7867089321.pdfIn PDF document text
    • http://safetruck.gr/images/file/nupunaxotepemol.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/sakapi.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/setomegij.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/nikaruviko.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/setorapex.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900fdcbd2e---ruwoxenip.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gagotavafunuboxotik.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16311351721472409632.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/52509082029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+block+a+website+in+mobile+chromePDF 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 17756 bytes
SHA-256: ac2393cc3d0c872fb1495cd3237dc87f70a99b5b4d3b356424f326ac34fe122d
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10804 bytes
SHA-256: 166963b74ef4d99f15dd9c6aea3789d4cf48ce643dbaade10d0f506a5290e700
font_02_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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