Malicious PDF — malware analysis report

Static analysis result for SHA-256 da84431619672adb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 02:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c84b14b10f09480c79bd26ac5dd0761 SHA-1: 9ed3c5a550ed0371dbcf67bf5193b7d43ec5f6a8 SHA-256: da84431619672adbb6a9cdbb1a17434bc8a1a3e47c7dc2212ba1060672f0b073
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a link farm pointing to compromised CMS upload storage, suggesting it's designed to trick users into downloading malicious content. The heuristics indicate it lures users to copy/paste clipboard content into a shell and provides password instructions for archives, likely to bypass gateway scanning and deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=unlock+pdf+multiple+files PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0424fbf8c4746f4a21408c1872b1811e/98579066602.pdfIn PDF document text
    • https://masukpt2.com/contents/files/xosup.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/goreneruregibibipuzibu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/91650477014.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/789815213.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/rakebedosejevujub.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/lofofiseleb.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0ede386a0---31873023255.pdfIn PDF document text
    • http://cecev.com/stockages/files/14510362560.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/gewesoz.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/rawemirenalibekalepa.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/2005079726.pdfIn PDF document text
    • https://apelhijau.com/contents/files/rejedibefumobu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/75956042620.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/255568230.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e746bf924a0a20b2e846d3087dd1afc4/zajopekivomo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/34333893451.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/35131844377.pdfIn PDF document text
    • http://mebco.ru/images/file/75727900833.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/kotibumurojugevakugize.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/nirelebebivegagekizezuda.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vinez.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/jegozojadipurotimuxojubeg.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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 17928 bytes
SHA-256: a8c5174ce9c78448a0786e68dbf2b50ceae7432ca8d2eceee2fb5d83368dbe20
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10716 bytes
SHA-256: bd08c33f3c77116e8a075341c6962ab296fcb81f99637f386f6ae55658819001
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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