Malicious PDF — malware analysis report

Static analysis result for SHA-256 f693e63be3b9b878…

MALICIOUS

PDF

81.8 KB Created: 2021-08-31 23:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fa1a90e61ab58eeae9665db66935104 SHA-1: 3b1bdd08a94b9b3f3aa0b7ab1d78b4f5745598a1 SHA-256: f693e63be3b9b878e6d61954d3f6380dc96718a44ab20d295577f0cae1977214
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a social engineering attack. It employs a 'Browser Install Lure' and 'ClickFix' technique, instructing the user to perform actions that would likely lead to the execution of malicious code, possibly by downloading a second-stage payload from one of the numerous embedded URLs. The document body itself is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links and social engineering prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54db0da36---78300051776.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/390baaa3e9fbbba3cfcf1ca6edc3e0a2/bozujijagogu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dfe2b44c---48078691237.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210710091418_swp5s5.pdfIn PDF document text
    • https://suksesunited.com/contents//files/79118204625.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wosiditanatimewik.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/juxesasigeseton.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ca40ffe3---76530083769.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/7aeeae532f413216e751f09f09f46991/xaboxazetejafaxutotasiwa.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/89757756870.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ed8d975e---zapitagorimomisakukon.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e51c9ea26---595735001.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/20376898264.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/gezuvibiso.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-7/20210507080807305619.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/98896884947.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103cd468d573---modogekijanowiraton.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xibawazelewubumevitururuf.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2937a28b9---44499342679.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/mewudawibaf.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108241545587688.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/rinokekijibuviwomizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+update+windows+10+updates+manuallyPDF 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_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 17628 bytes
SHA-256: 13be4663d701d2cf7386b7444812883e88e0268dbb30df5e06fd9ae040e3b90b
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 10916 bytes
SHA-256: 90efa8e295217792ff1db27aec49d6c268e9badb9624d210874a3d7ed1acde25
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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