Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a41ef34646d64f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 20:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: af3887f95b6517e9e7297d98f0cdfd95 SHA-1: 321e9ae07b9accaea899572eef7a4c769d6f0591 SHA-256: a4a41ef34646d64fd67e6bd03116d72ff44af242a51f1e868c5ac997f7a09027
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of a visual download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=free+fire+apk+no+data PDF link annotation
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c799640d0f13033ac0f23eb5206660d/berarikug.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/44721782333.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136439817b55---40419828427.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/78258585369.pdfIn PDF document text
    • https://22importexport.com/eimages/file/januguvexajuwixiborali.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/78654328282.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cc179304aad9c0bd208546ab6130ea1e/kedosuw.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161396d328b487---tidosofoseroj.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4trgvo55ns4jknofh7ju10gsre/22928116348.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498ff83864---tedepusudafenewebes.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bozumomusedoxagegigonew.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/wujopew.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/zaxarodireweleromujazilo.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/tanoxajobosojema.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/97286228594.pdfIn PDF document text
    • http://cochemical.com/upload/files/vuxupeperoferapopofu.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/4220048073.pdfIn PDF document text
    • https://eventaipei.com/upload/files/dunewibefab.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/6460778977.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/sezegabikit.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131db0dee917---41148248199.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/70033179093.pdfIn PDF document text
    • 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 10348 bytes
SHA-256: cd59ee53f101d87e48ec8d45122920eb01672aa0f23ce58c646c99855dabdcb6
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 17936 bytes
SHA-256: 9b87946c8b8c35bd3f7d637ca8d401e8016d1b03ddf4008ba66b9361455a5f4d
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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