Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffa14c4dce43b71…

MALICIOUS

PDF

103.6 KB Created: 2021-09-04 07:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d0d0e9fdbb7df542b89fbf78f123f8d9 SHA-1: d7106c6c3bc5b5e59c4d479e4a79ec2a66a9faa0 SHA-256: fffa14c4dce43b714128ace6245d859b27cb1bf7795dd10bff84e9ccd2e89440
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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
  • 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://trunglam.vn/uploads/userfiles/file/nomexusu.pdf In PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/dogolewabotirupubifepira.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/lipuzirisusebukamoxu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r1prig9t6dhk33cdju32iop054/nudat.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///xogesufegotopojonokalu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727816b8b3a---29960588897.pdfIn PDF document text
    • https://msiutilities.net/documents/dexutil.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/53870084388.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28246e2b4a---94960437746.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/63248562997.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125cd78e5c4f---10870304741.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e56ac18d8---96954220905.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/risoxudonisavewesotar.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fd577184---wutiwunoguvutanaweladoraz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a778e039ff8---xunenataxefoketizon.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a7aeee7d---fawimukuxusanuji.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb72b87e19---zigisakor.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/67401630324.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727e4c8c66c---46833788466.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nibosiwusejifeduvugelen.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d047d6ae5---69274026274.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/dbb9362e660b4069539a65ff33507b41/40768135037.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/pivajuwagaxugojefelobugod.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7478e4f05b---dotesevibuzerumipijak.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/56651803809.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/34207109855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=criminal+law+pdf+nounPDF 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_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14897 18800 bytes
SHA-256: e47666db2dc265be8cfabaa8a979e8f1c20887aa2bc17588c723c2e0aed1ecd6
font_02_sfnt_off0001789e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1789E 10476 bytes
SHA-256: 9b7d749d465197fd3a3875d579e635da4a8ee9644b2811a20dd795cc2123a649

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