Malicious PDF — malware analysis report

Static analysis result for SHA-256 2280d22729dbbcbf…

MALICIOUS

PDF

97.8 KB Created: 2021-09-17 04:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8acc3e1996ea92b6d93ac78b9cd7a3c SHA-1: 0adbcbd68d05fb0719bad8673cd13aac266c55e0 SHA-256: 2280d22729dbbcbfd72f4da041baa6cbb964b348822b8a2b7b298a9364af61ec
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it acts as a lure for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=wallpaper+android+ice+cream+sandwich PDF link annotation
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/nopobarefike.pdfIn PDF document text
    • http://rcmo.ru/upload/files/jutokoj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c713472ce---20083055407.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16143619612836---lawenizi.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48445022407.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/23477336028.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/80661816248.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/42745165159.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/kevadonaxofobuwilisasaber.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/xekaxamexupagonaxurebe.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/gifabojotup.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimejelisipazijuvegix.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/furitorisujujesit.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xefizikakajeril.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/24361645244.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/22868288879.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bb6d89b1---vezofesuwuxasiwen.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/kukirefijugagine.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613f497fb5c23---58388728717.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/satajikuvufazejero.pdfIn PDF document text
    • http://shevtsov-art.com/uploads/files/fexuxepivulo.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/jeraxe.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/57592994292.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/25547739423.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/duker.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/71447277803.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/49638085641.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_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 19360 bytes
SHA-256: a620e755f093593a43ed0700e13dd364377e56f5622f4ae5c6b0cc8de2c7fbb3
font_01_sfnt_off00014868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14868 10760 bytes
SHA-256: 770d358742333dee7279f2b8b871fb4e059b2e0e6327ab3c740cf0f5962d1f7c
font_02_sfnt_off000160eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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