Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c872a8abaf1778…

MALICIOUS

PDF

99.4 KB Created: 2021-08-20 11:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 33d63bd4cd81edd06ea7bc22282f48c4 SHA-1: 3414706940b7e77cb8bdd5bdb7aafb99b8a88e68 SHA-256: e8c872a8abaf1778ca1fb719e5a95df14c7eff578a04a2ad7419e43d2bdbb124
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware sites. The presence of a link farm on compromised infrastructure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.phuongdonggolf.vn/app/webroot/uploads/files/kiwumukovofaduben.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009262eb7ff---35972588968.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/11001055997.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/86700649199.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3j7rv0r1g6s6fjaq4j0urslqe3/lunubisibipaw.pdfIn PDF document text
    • http://gabortech.com/admin/file/wizikelezev.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083de96a49d0---bazabemu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4d7938f4ed9fa27be3df4b6ad5e8727b/46599253180.pdfIn PDF document text
    • http://planbmedia.hu/files/4970119691.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/82328527188.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/92374277091.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/supafakasedenunasetoju.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96d600f70---20535568593.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eea757eaba---58737401461.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/80201188924.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/80912509693.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/15979760025.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0a0b71b27da481d97084e434409136e6/rivuvekugezunomevavu.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/megazobotaxima.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb70151e92---77560460861.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c008a74f338cf55adf6cd0e16f1e5f41/xoranawozorarogulebi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/mofisugubidawinare.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5f95efcc60112f74ddb5dadc882512bc/bajibagajujidivilukaxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+de+ecuaciones+trigonometricas+resueltos+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/viremoxedomid.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_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 20056 bytes
SHA-256: 906c0ccf714df08aa043158c826452b7ca21bbfd65594f9f6f419d1a1d57cf2a
font_01_sfnt_off00014a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 11176 bytes
SHA-256: 557e1f1e709ca56d606dc27240ce0cd99ce07ea45ba3050b44848645d3040a58
font_02_sfnt_off0001643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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