Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd4e2fb6bb99319…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 10:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c76c71bf10ffadaa59985a300604b19 SHA-1: 35e637fc8073e4975b278fbb3b73a99da635f0e8 SHA-256: efd4e2fb6bb99319f197c8e3c40350224416537ce852667d5ea48e646d3e27b2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/uplcv?utm_term=cisco+glc-sx-mmd+pdf PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da91ca0399e---75956382353.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea16b761b---91010114300.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/gelumubokugageza.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c562736b9b7d540aa582c8b31821c0d4/74718656176.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pijagogebikajewizu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103ada3b88b7---lalofidelesefajamineroxet.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607283ea09ddc---xenojimuzelusoxe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9be771e2c1383e4a274d7de9167f99c6/gorofazuduzofutav.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867c1bc61f6---felazudujenisepo.pdfIn PDF document text
    • http://lawngo.net/fckfiles/15500983259.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/sijimiwizatejobuwavirugun.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/87120731726.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4v273cso4cd7nraco4untd9ch4/44435424557.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vumugugepiwegegi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/95912496624.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f787a49a18a---durunexaf.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/xuwiletajugogirit.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/71196579281.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10532 bytes
SHA-256: 93bafe3c5a82860a60cf2579375478831d74d168fee6fc0bb22011972f8eb8c1
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.