Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2dba478373d0e7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 10:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55fd87fbd04e2e61fb6ab5e2ffeaf942 SHA-1: 12ad1d04961cda6ee00519f4a48c7da678e3cd32 SHA-256: 9f2dba478373d0e74b2193b65993d854a8c5bd97a6bb906764012a744f818aaf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document exhibits characteristics of a phishing lure, specifically impersonating cloud document sharing services to trick users into installing malicious browser extensions or updates. The presence of numerous links to potentially compromised or disposable hosting sites, coupled with ML classifier and ClamAV detections, strongly indicates malicious intent. While no scripts were directly extracted, the document's structure and embedded URLs suggest it is designed to facilitate the download and execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67752e56c---84953742101.pdf In PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/42592583139.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa12b3d12---divaputoligubetam.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/81246422183.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793980e6daf---buzusaxisesejotaxikozepif.pdfIn PDF document text
    • https://abeess.com/userfiles/file/49933616323.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cffa7f4282a4b2761d312b355186cf60/4854420308.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6cv79vfddjeheb0dolq8tn8cqp/fubiliv.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gajogofedijigidubopoji.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210713_235131.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123fae9a6386---17044923777.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609066af5ee2e---papemejego.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/46754405390.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/4116073834.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/36752791174.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xunatiganexafekaxip.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089b36f9cc85---89716763663.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b81ec8e---79865132408.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/23920377694.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/805a21bcac9db5c9ab9f88c7a71ea49d/lapiwekedagowunekosovezob.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/rudaniduroromolepo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9u57omvhdmh5ngsig4hvpfph3p/17430383325.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbb5360eb8---lememoreniwa.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78559460cd---jabug.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/63886029899.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/duladugeturirif.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/makuri.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/13454785097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=search+pdf+documents+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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 19484 bytes
SHA-256: 7f6875a24d9962c1d13662b7b4afbd021755f1e8a5fb855bf6172b63f6ba1930
font_02_sfnt_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 10920 bytes
SHA-256: 3b962be8004c38aa1b7b3be1ac3403e3ea232cb8c520a4a20630850d64e1f92d