Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1ead1f852312cb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 19:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e25837a0bf57481deaf42a9ff47aad1 SHA-1: d77a7a68df69033eeff3eed03651a7d83a6f5315 SHA-256: ee1ead1f852312cb3acf90448dc269ccbfe6ee19fe3cbd1f5cb28117173d513b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various PDF files hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148518e0d132---diziloz.pdf In PDF document text
    • http://kaizousha.com/js/upload/files/gegozopewefawinilawuro.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/15579151640.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc9d59f79---88272848832.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/lasape.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436eaaa8cd0---67370501110.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/zowozuseta.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/60909797969.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/vugixepuxu.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/sitonufifaru.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902160200469131.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/99604702746.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/matijav.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/99387736127.pdfIn PDF document text
    • https://phunhai.net/upload/files/37963641206.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/7337754463.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/57259618153.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/jodusopabixelosid.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/rexebar.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29592253637.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/77002508931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=slender+last+sleep+apkPDF 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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 20220 bytes
SHA-256: c05a75d1865fa7eda797fd0543a3d3e9942105cbb2d693baf744868597a92de3
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12729 10340 bytes
SHA-256: cf376e15021953d477e419a1a7acc9cb241082e836a3e2bad2d32cfb5a5ebe2a