Malicious PDF — malware analysis report

Static analysis result for SHA-256 703513c772d34887…

MALICIOUS

PDF

77.5 KB Created: 2021-08-22 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1384951d520c6ac4030e0825a16e3d1b SHA-1: d4188950546953d217161e9c239b562e6b59f9e6 SHA-256: 703513c772d348877b9d02573733dd956921a41133c39f849d67bef67c0bd2af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073003653351---pediwi.pdf In PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/kodokanunanupa.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/63q93m5dc3352n0ev3g4i2n1hp/zezijus.pdfIn PDF document text
    • http://zae.me/datafiles/file/xipowinoxanoguzanuxe.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b7ee13a59c744c4214269cb571907642/61496997718.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/40679056668.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/57259665994.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fa96c9b8---batadepolujep.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161192d102cfa1---kavolapaw.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efd531f88---runokobuxunof.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wokiligu.pdfIn PDF document text
    • http://ozari-ua.com/files/file/81364862816.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f7a52b6b---vexarerikuwisasopali.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2a813cbe---38123709167.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7fa71f9c7---40537813456.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b005d9dad0f---watasekepikij.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/18396979205.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/50651513219.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/84491760144.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/mijivikipo.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/zarofefezezumeligog.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/jegavusaduxufujudelogiwen.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9og4o95f35912qr2990814jsdh/68080150791.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d954c28850a---posubebiriliniris.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sefomodov.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/48949714881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=song+i+am+a+child+of+god+lyricsPDF 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_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 10880 bytes
SHA-256: da90c8e13fd00ba1f274776d555c0ebf4f0475b5a8186e6c3935154bf96de9f9
font_01_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16880 bytes
SHA-256: 290a8c2f95d6bc5b32df03677927aa311d0776bfa22777db682a2d76daf35685