Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9cf42b7a28ea61…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 14:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15089eee54bf4dc1cd54e7e79c975c69 SHA-1: 6240405d17e9e03a2ef099c816054956a1b52304 SHA-256: 0e9cf42b7a28ea61e96a3e8909f35926f1bde6c0f1aa1dc2631965271aa25a0a
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple potentially compromised websites, likely intended to lure the user into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism. No scripts were extracted, but the overall structure suggests a multi-stage attack where the PDF serves as a lure for a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rezidencianestor.sk/app/webroot/files/ckeditor/files/36019272582.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160713cbf3ae30---xiwipitegujin.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/32463805292.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/92605105262.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/30731990193.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/754797158.pdfIn PDF document text
    • https://istanajp.com/contents//files/nasajuxamedanivikusuzom.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/fb043a9e8ed6b4eb8de32553073434f3/89682165675.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52742781892.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be1ed83b670---mubuvugo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/xefelezodebepigubefomoj.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/99852153370.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e603d420900---febefiz.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/84530072432.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071684ae0b7c---vigoj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68eec6c7f---mugodugazuratif.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/sojakikukaxe.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0cb4f18a52a9c03e2ff32ffa6a0d6014/50833979795.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fdcouj6prp65bvibi6eupmff01/gosigizopawatatotujulev.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/16430995679.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/zaxirumizuberejupadifowam.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/49748623243.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f470507f2e0---71848026569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=walkers+game+ear+micro+elite+manualPDF 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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 10756 bytes
SHA-256: 90dbd190de5bf8d7807ed5758a994505a9bcd4e946024eef2fdaf31d9626146b
font_02_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 16124 bytes
SHA-256: 9e86a425f2ae851b1000c3cb413188fc43e2233ffd1d798da75eaa993968f667

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