Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf09cd8dc1b0c314…

MALICIOUS

PDF

85.8 KB Created: 2021-07-15 12:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6200633439c0c55c934e3068b9e27b00 SHA-1: 0c8c45e2d6d9e426e79d72344016db12d22abc10 SHA-256: cf09cd8dc1b0c3141629066358a294ec9446eed31647babc3a3f33a88ca716e5
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2505

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.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/16aj8cgejp5b9unuqbrru47r0p/76338874159.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pma4tfv5mrpics37b7mq89dv3u/66235551226.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16089697d03aed---40471283071.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/891fgic3no93665c439e5p2r0o/42986737883.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/106a8a10df2c27fa8b873382b530c662/temitarotuvipewubetinizu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1h98uat41l9iqu3b1hl833bj66/nezowofefurex.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jufobujifuverapimeduvejan.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/dutanubafeloxari.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nodozu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xuvirojegofuva.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6ak6nkep2pmrt2fls2mq1m5ens/20023088747.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zodimaxota.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c73a5bb8f619cb23821a4c046f4c05fb/nozukivakuwidivebubave.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973c00aea81---lanevejawe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0f719194---33531794458.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/13087598114.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8faf617e9f401fe33fc19280de1039fc/pigomi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a86e3036412313812f2bcc74c42de68c/gizifisur.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085dda6ef87e---14789297373.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg67pet72d2q9gmfouiusub3nj/13643660047.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/59744473934.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160babe544efb1---87541083253.pdfIn PDF document text
    • http://candientuvibra.com/images/file/18808160571.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88cd16168---57794075410.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/naser.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/jonenake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=finding+the+limit+from+a+graphPDF 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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 16988 bytes
SHA-256: abb582dc0dd245653a2e4e524e74fd781b5935f29fa22694db3d3615aff7003b
font_01_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1