Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29c57d9ac39a441…

MALICIOUS

PDF

69.3 KB Created: 2021-08-15 22:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e81c97f665d54a2eb9d4edd201394a6 SHA-1: f031d13fa1e000e7998fb711b210d6c02b3b26d3 SHA-256: d29c57d9ac39a441cfb41f30fb5d7be2c1e96a2ba6c9d305d9e53bca81bcb89f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to one of the listed malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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.
  • 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
  • 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://parklanehotel.asia/userfiles/file/ruxojefilexevamivedup.pdf In PDF document text
    • http://serextion2006.com/js/upload/files/40456232214.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/51e2b46923d046c65683ec5b868ef4eb/88088506169.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b51ab3398---fogumekeno.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160845c4e74771---bumosipel.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/odvi0rjau13313oft2t4hgkt56/bipenolaxipugak.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/redujezekitiledi.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/hnbumln921eqe2t2ithghv7a60/boxafaxubipifubagazubade.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec3c21a4f---walijarelupubi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/16f3c41766f3ed66e3d28a2eac36df1b/92729325287.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/8d2f71fd8222c9855b33e7c186618cd7/60309722379.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/sujpuik1qhud0cfova6ddr11nv/96954625501.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/rojupinejobiwusu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0542f3c98a---vodipipeti.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609877def31eb---nowefekodogegixoberiz.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/kozopiwanoja.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/216c227d33ec997c02844aed60bcafef/11445686750.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be3141aaf76---21488941500.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ab98fcbec7c185832a2cd8f2ff059fef/95342207582.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e822dc934d---xerikunuguwamuvusego.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/70442065876.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb683ca6099---16074397094.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/zevapujeposoresawelubolev.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160831644127c8---11637486344.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/vuzuvodised.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=exercices+corrig%C3%A9s+barycentre+premi%C3%A8re+s+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 18348 bytes
SHA-256: cb74201a4d50fca8351806c582a098aaf17a08f98439f4ee1a0239e862d3156b