Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce219fbd5229516…

MALICIOUS

PDF

81.7 KB Created: 2021-10-06 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c428559698c2675caa9d896f95417072 SHA-1: 6d6cc1cf28325b58b757e384faebab4e398f67e4 SHA-256: 6ce219fbd522951651a3120f9d15a9377ac91f2f7cb19749f9e574ea07d288c8
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF utilizes a link farm strategy, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content or downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=patient+counselling+pdf+download PDF link annotation
    • http://bankerz.in/qpic/files/37391320625.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/42594987142.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdea94dfa3---63389238040.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/jakadijikusuvaniferix.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/fabovakafotolamawaziwapop.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/lonotevamisubusu.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/3694014324.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/72a65b01dbe2a15d53a34a0d2f9ffee1/49355751160.pdfIn PDF document text
    • http://wdnederland.nl/file/pegigizagezuzomironasor.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/djto7q10ur6darlu57h4a13kik/66613649799.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/mifutuleba.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gakeronagovawudivil.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614caa18ec07c---vigud.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/xaxobibejikasadekir.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/gufitududaromiwulelafit.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/zoxegogewaned.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/85468045315.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/37951577066.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/615d1cee1ce5bbc9da265a13a8f8f988/xowopugazibuw.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/35567176445.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a122f24fe1911e2b0985f1177ecd4812/zowamukagi.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/lezosuwulixurunuzil.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613524d1e2def---23241002839.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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 10884 bytes
SHA-256: a6a13be02d7a488d8af9d161ce287c8fa56cb06ed76b31445942a75859215810
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 19532 bytes
SHA-256: 996a67182cc158f3483f4672f1c0dff4dbbeee05d3af47baceb3d74224875d24
font_02_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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