Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc948daee1babe7c…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 04:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3c6dc5af2f295829d2e9c05bcdbfdab SHA-1: cdd1aa2cfabc5a2abdb942efd075009fbf2df959 SHA-256: bc948daee1babe7c7ae137c87ff5ed986deb9700a3d4965c96e9b4521569483d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, multiple heuristics indicate the presence of link farms pointing to external PDF files hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • 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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cj9u0rvbm843sp3kfo4p37e10e/39150701133.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c252b86df5ae76113417e1c7cc7e0b3/pemekufomowowimizukopi.pdfIn PDF document text
    • https://renetravel.ro/images/files/limameroputubanotuk.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/fererevoregelesepewizusef.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/luxekubut.pdfIn PDF document text
    • https://etadelloro.it/images/file/wezojetexubenar.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/49de5c4fa2f0c679526e1b6957401ea5/pisemulujesude.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a0f8eff47563a19e2d7b393847509303/5409317690.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f89197ed---favewedixasedej.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/99470060511.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0767956ba---44947438009.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/latagup.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/62267329543.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609095003a67a---nonapad.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/9hgtnjrq65g2b2b3ceb9mkbvht/gibawefojebopebolakepiv.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4olha75r0a453lvolltomps5u6/30014540111.pdfIn PDF document text
    • https://skspiti.com/userfiles/files/nopageludizufowujipagelem.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/zezad.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608be03052e0e---tunitukesezimidafiniwore.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be875ec342442ab51603dad85ccbd949/64708482035.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/barewafuwotapewozevopu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/9db4636dadef46392dce018056f79fba/zobasiwarobemirokuvaji.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/27f2f1ba5651cfdc3691190cec028582/mupafajaxazekofigifura.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160745d01df1e9---panasikobabexefiwiti.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d49abf17---10562091016.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210613040742857362wz4epb.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160994a6d7b861---25450150799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=work+recommendation+letter+examplePDF 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_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 17520 bytes
SHA-256: 0b0c063bdeccbb4d2d0e4d119ff372e01fbd4ad62a7365b7d1b3c07d640661f0
font_01_sfnt_off000137b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B8 10692 bytes
SHA-256: 0d1a80360df50d854002d8503b030656bdae445c9fc30135030f220b17cbb844
font_02_sfnt_off0001503d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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