Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2bd48688ed1465…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 16:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2b656f07cf30d28ae2a8d48ce7b5d6d SHA-1: 78512aaeece7a3a200b8e724910504f717647cee SHA-256: 7a2bd48688ed14652a44021e1f212c6f7b6fea975b2b4482187427b144b8e4cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=best+alexa+skills+2020 PDF link annotation
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zamirogoku.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b649e133f---jetinafiguw.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/97968366622.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131456f9904d---loguvor.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/3888977890.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/36551879335.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fipugadupususa.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/87446897905.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19523622089.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/36893764803.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e32ec9df45527ad70b213489f870b6da/xazozobebin.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/78de9b30798970eca96f19100872c440/83840388191.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/gusutavamoberi.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/56004153.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jejuraxaluziku.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/24450648368.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/basufirinilufegoxubeni.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906014943.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/zakakudemamutegivun.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/21612247877.pdfIn PDF document text
    • http://arsvet.ru/img/upload/jenegakega.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/woxajetulejoxafi.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_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 10264 bytes
SHA-256: 787dcbe522d653ea4bec4d7a75d1d32d341f12e1d969f1975f0fed806b827bf6
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 17172 bytes
SHA-256: 2bea6757c8385cae5dfe94ff330c0430baa71cdfe8052c9da17ee83f0b324096
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1