Malicious PDF — malware analysis report

Static analysis result for SHA-256 72da3c7af92018f3…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1db978bc01664743fd0df1b97547eda4 SHA-1: e1b7dba50b6663bed14493c8cf58ad89d9124e10 SHA-256: 72da3c7af92018f3eb5ffc5e11509e7dec9c9bc088976e81f36d8b151061db2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://mama-light.net/business_school/uploads/file/gejumelenosenewo.pdf In PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/65999014143.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/64914655795.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/93ee0ab1d87bd3e647052675802c9fa9/72292641082.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/gegufujegegevovavodimiva.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/manesemuvaxubilax.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/rivazesebazefuwira.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/73693169014.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/95603891846.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b3f39dba---47864670847.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/buxevemadufadexafuw.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/nenepujorekufezokobodov.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/1334017957.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5562100c6---13215199085.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/tazadiwakolumatuweme.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8d5bf577b84426a83f32a177e10d8221/wevawapip.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/matiguxinigexelim.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161300538469b9---27258208519.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1900738003613483e5716b5.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/92736819003.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2qr69gi2sd7eseotoi33nn3h0le0npa8/31438138868.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/novewawojanoporo.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/15168572622.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/suzem.pdfIn PDF document text
    • http://capri.lt/userfiles/files/94071602443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+android+1PDF 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 19348 bytes
SHA-256: 23a8e7e91bb8a187a224c90446eee1bbe67540f362c01a1dff8933f5a0a1acfd
font_01_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 10464 bytes
SHA-256: d952a364a08a33b8062bcf3f1ca56ca2a8595f261e0a7c42fa56c9d37cff2122
font_02_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1