Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03c8546ced631fd…

MALICIOUS

PDF

88.7 KB Created: 2021-07-21 02:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eee1c1efd758b346674be6a577a336cc SHA-1: 2460a1c5527561ae541f4385c193fb3040fe4cc9 SHA-256: f03c8546ced631fd78c9c53a5db36ebe9387cd3d7de921b7ebfddbc8d587f6c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and the heuristic firings indicate it's likely designed to exploit vulnerabilities or trick users into downloading further payloads.

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 http://55thocscompany.com/clients/62662/File/21599377908.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/5f84181deff84cb6fa2f0626e8d9d0cf/8729210973.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fratvud3ucgbfvngf846p9soui/24449241691.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/58667710636.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1a175cb4ca430616a74343b5f134da/92024880179.pdfIn PDF document text
    • http://deauville.ru/files/file/79412143667.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160734d9dabf9f---nofobi.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/jutofiguj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079564fc687f---54557764880.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa55e0acfe---vusiwogudisik.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pgjp3fp8rjm3hbafum7ngo3jnn/wanakikosenudabutukexu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7hr9j0gmol5ca53d85u3evdso6/65848451502.pdfIn PDF document text
    • http://apsons.eu/files/file/63602132743.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be53af38b---45136957494.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e581de23597c7b89bebf220354c49b7b/dukur.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/47687401951.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/toretuwuxe.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/19348886844.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a1d192c54aee72b06226f043c677be6d/30967585174.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc83e4e95b---90780201208.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/71062306052.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ace6e43ba10e6ac318d5b23c35a6f772/3536368488.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/baac79d8a129b3e394d40f7ad07b6677/37559137305.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/motaxopuwufaf.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/monirinedavofipubarevez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=across+in+the+universePDF 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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10268 bytes
SHA-256: c001b007f2f2c1c6014c04bed896e6678e9876a54abc835e20f4f40a279021f1
font_01_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 17236 bytes
SHA-256: f6c7f9256b33753cdac6db2a4e1884a93942fc3ffefdd86cde4c0b9e75675db6
font_02_sfnt_off00013db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1