Malicious PDF — malware analysis report

Static analysis result for SHA-256 92844e76e480a22d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 09:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef9e0a318be7e1025e0ef8dab79ff2e9 SHA-1: 045e0b35a508e2744e6c466c27b24e4f5fc97b0b SHA-256: 92844e76e480a22d80a13e288b49197a2e0b3bc2427fd3d5975d93b04c978b4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://queure.ru/uplcv?utm_term=unlimited+rare+candy+pokemon+yellow PDF link annotation
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qgla9ltkgpuhueveto0c4r6ac1/23786705689.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/55999919320.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a20f5a5c9---bukoja.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5e49ced14c7df4fae50f25b733c1e00c/4924437396.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e57ef570---20683315292.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/87709554267.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/rodataruvabafikelupigubep.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/kigomuvabusiwizedozoxeto.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/40430136860a27d364dd4e.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/66839480675.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/nadudidoratojojijijiku.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081e401685d3---vumomulizusoxujitivapud.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/66720576866.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/44539289401.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zomexugezomiwiwavuburaro.pdfIn PDF document text
    • https://casentinoshopping.it/file/82875692406.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcce762018---fikevofubiledivu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/fepenapivuxuviboj.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/maxovumivavasesow.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/af5psc6022b46gvdlt4ovvq16o/77030647133.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gevepos.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d095cb701e---bonodigunujiferifalo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nvi3sd7atcc4ojt87167t77is1/35613866762.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kuniwif.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3883b7b2a81e994a5f12393593769dad/venibumeroj.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/goxibusikosapumi.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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 10808 bytes
SHA-256: ff7b7f08ee76f74935b37c8af949b7fcda59f2c5e62756e8827f6c9e1fdcb69d
font_01_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 17880 bytes
SHA-256: 452d802146eb5d5e6e28a0a23448d3917b134acf3cc1ee98546a3348dd4e4a82
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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