Malicious PDF — malware analysis report

Static analysis result for SHA-256 f643db59c39fd445…

MALICIOUS

PDF

79.5 KB Created: 2021-06-26 14:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bfbc658161808bf398d0a0b245255e03 SHA-1: e9b22bf43d5124030d1ed9cab8caf1a4434b6c23 SHA-256: f643db59c39fd445cde8e7ffb52d8d4b9acddf17d570d7dc733231cf43ecf6b7
154 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the detection as a trojan indicate a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7480

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=what+does+sosa+mean+in+spanish PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/94r505jjdqtdejnk22nhovs0rb/polesaruzul.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/57ebf6b582fbd900ea29db0dd94849bd/51147594639.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f14b76410b8698117f27325766295eb5/parabanajunolegibuxoxi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831a63c41c---84147593312.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/la9d6qq35o127ovkdg45i5iqrm/biloxuku.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/10040222818.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a5jj3ah5vrjqrjpumeugeh3ujn/75278910259.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/5478688764.pdfIn PDF document text
    • https://naoshima-habitant.com/20556155560.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0d3508f412235a437fae2285f841df42/lipavigogobajolag.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6284cf94779980b75744772e8034c676/nixerafimeduri.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6aa1ac02dea0f42aaac3dfb8f3c013c6/vusozuputo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607594b09fd54---dajasapisexusikos.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/56669699392.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b07257c2e---67627792469.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/71090368395.pdfIn PDF document text
    • https://chptravel.ir/data/file/japijuvajozim.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1431c3577---fizero.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kujipedosi.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/92538293406.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ilpvr3k7gsajnef7g4gg6soq00/81948467680.pdfIn PDF document text
    • http://mopron.ru/upload/files/44104602147.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/30619385263.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/9de2f29acbf43669bf72481692fa0a56/mekusepefifagafixu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 18692 bytes
SHA-256: 9073d2abaa94f86ea2c80604b187a7533d1191410c469b8d7e8ea8b2d66c54e8
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 10504 bytes
SHA-256: cf0a32d0608fffb1555f5e8d268343b63b83ba2e49f998cf1dc1df47ea812423
font_03_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 2248 bytes
SHA-256: 4ee82ff954e4e2cfc5151419bb0e1778eb4cfe816f2848afa8351d059b10a6f6

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