Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b67b0fd811f6f…

MALICIOUS

PDF

58.1 KB Created: 2021-09-01 02:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc3c38e38b2ecc8aafe4f84326b68f2d SHA-1: 6b6c7d8ffac9190ccaea89824a7ca67170840751 SHA-256: 4a6b67b0fd811f6fa5a772027a21e46860a217d174889bf1e97f62d8f65d2120
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7531

Heuristics 5

  • 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
  • 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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8752d9c08b---misalutijefo.pdf In PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/waravefodananujes.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609498d7ae18e---tidanimokeb.pdfIn PDF document text
    • https://bselink.com/userfiles/file/47136621776.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6q2ih5jjkrdaqbp01shschqabk/gifibofoxoterewuguzilix.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357fe0ae24---gipebokoxatovezetor.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/wikinet.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9f528764feb0fc521832db7d81fa9a90.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/tolevadiliginenuxow.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/muneruboxezololeredaboro.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ecb8e81f---nesokepofuwamo.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/89327663135.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/ridepidolazineti.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797b803e2d5---wofibawenatudogiba.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4k5f7r5sr1m7574i9s8n1qlbv0/katulutek.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079741018841---38911075827.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zutobokiwoxedusog.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62123270063.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/34b72411f5d6ac31b4483cb6ab8085ff/52625549244.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5b001c63---88845853174.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/63951996129.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6617540344---fazidoriruponadepex.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/76783107080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=baby+veggie+frittersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 10492 bytes
SHA-256: d6a7218b8e736dace46620d3e7538fc86fec6693fa14c14c9db7508d8eb7a84a
font_01_sfnt_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 14544 bytes
SHA-256: 9f26a9ab5cb09bcbc31dba00fef86b2d8ad899f45953635f5ecf2703e98cc66d