Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f3d87e4035684c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 15:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82b6616d84235f72889279f889eacf93 SHA-1: 7c10574b1c1fe0d0210ad7269d1986b4ff3fbe75 SHA-256: b4f3d87e4035684c34269d7f835b7ccc1d9ca38d164880c4dfb9717d7bcc1923
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple links to external websites, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social-engineering tactic. While no scripts were directly extracted, the nature of the links and the lure heuristic suggest potential for further malicious activity, such as downloading a second-stage payload or redirecting to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdf In PDF document text
    • http://familiegravesen.dk/userfiles/file/maxepisuxegom.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/83224721898.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/45993627432.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/15839860071.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2b3da34e---83149750856.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/20460869734.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/13115829048.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/18656220168.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/sidafamelejazugemefomino.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec6b4cde0---surebuwiruxevuki.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/wimabijebexepew.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/wabad.pdfIn PDF document text
    • http://wamer.org/userfiles/file/44372773197.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/64e27f4523dfd69b19b729f6c9dfa5f7/68347726351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=html+css+projects+pdfPDF 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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 17152 bytes
SHA-256: 81ace33b819415bacecd0cb164ddcbe4181feeda1e3ef1c6c5a12d4d5ed6df16
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10544 bytes
SHA-256: 99311d0c4defac23b563ae6e2c3d2b34bf057ce0f51c62e20f8015f463f9e16d
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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