Malicious PDF — malware analysis report

Static analysis result for SHA-256 794d5a91ddc5cb31…

MALICIOUS

PDF

85.7 KB Created: 2021-08-11 03:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 972f6fe8329b19f1c2a906f103b390bb SHA-1: 6a682896021a69d5b535fb1464df08bd82b2f404 SHA-256: 794d5a91ddc5cb310146ca9f6632fc81fadce154b7d983bf5f285936ce3f6409
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0f41daa7---musadomanininet.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09ce073191d9df4fd7d094e96ed584fe/7712792072.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/ramoletojepifefafasigajij.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/59619135340.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/fuzedogepovutefatafizos.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa682dde---sasazevoridiwirila.pdfIn PDF document text
    • http://kasargod.net/uploads/file/savumerine.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28bg38jgfbufnvu9vrorsc5br7/lajutinomekabof.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b589cca01a62ecc2811088a974f84a39/21633521526.pdfIn PDF document text
    • http://inncredel.com/uploads/42688871685.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a14407661---bapogozesoxolavifoman.pdfIn PDF document text
    • https://tappowine.com/file/zapipofuxi.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/gusazazedit.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/63268339166.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/495cfc9012b87e8965f3b91afa794322/dekolevumukekudesofake.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/27565223872.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/muxasodizabatakunej.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf54118ab---54532584347.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f31502f8a---70971455747.pdfIn PDF document text
    • https://conrays.ru/f/data/27322349355.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/41392471552.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/712930397ed14e4100a78eb2f41fa1b3/wuxanemavan.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/be2a45a3deaae660540d6a5c8bf93943/40980426068.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/31759739663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=subhash+c+kashyap+our+parliament+pdfPDF 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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 17596 bytes
SHA-256: 431d475bfabdb8df4f13cb3fec3ecb2d807228a1e886d16fec0c81d3ac3aaf45
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 11408 bytes
SHA-256: e9ff5127daa8bd49dac98c6a39ae0a9c16c945747ede810389f5ab9aa2761124
font_02_sfnt_off000130bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1