Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36f107240edca31…

MALICIOUS

PDF

87.0 KB Created: 2021-08-05 10:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 784470d574a5ec500dbbaaa5c6ac22a2 SHA-1: 5730210d0e7a68c3d723572884e6e66acb41ed62 SHA-256: e36f107240edca31600b9b25f33699002fd64d1d95088e19140b6ae1cfc2b4f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to PDFs hosted on compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2dc94e1a64---pemenozab.pdf In PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/kapudetadawagumu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098facf55e12---54644668531.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/64133849285.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/damilegeximuro.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbf69b40e---74624824026.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ecfe3bb1---jobadejudutuponebunun.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/22126408744.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210619_1CA328633E7E09EC.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lakewatimumixofu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160baba6e16ee8---84352075907.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/88540239695.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/84979856516.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/406448659e1e6c96d468915fb451b42b/83534512379.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zijikiv.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d053d1ba---57243657099.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/jubulupi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084361a8c6a8---52217885594.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/2vai8dhp56g5g2jh4lk3kt8i9u/77884695125.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nn5r00pf6s21nht6bv96dvdbsa/xanetasudoguzobo.pdfIn PDF document text
    • http://blatt-gruen.ch/files/vubepirimenafak.pdfIn PDF document text
    • https://ccskin.com/geektic/files/juzibugama.pdfIn PDF document text
    • http://keacg.com/upload/files/noragudozuwidoburezotav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=literary+devices+worksheet+5th+gradePDF 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17520 bytes
SHA-256: 7d9cc7861356a6d619d2b52304a08382a6705c99f29f48fe33579a9d62f44bf4
font_01_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10948 bytes
SHA-256: 5e677758477f703630f9c862c5e0367d18b5be2bb31669ae9bb1cbfe7ec5ef5b
font_02_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1