Malicious PDF — malware analysis report

Static analysis result for SHA-256 359041e46e1b3bfa…

MALICIOUS

PDF

75.8 KB Created: 2021-06-28 06:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5447fdb136dbfdf8d935e54a7d43aaba SHA-1: 8524e996951f29363dc4dd32df2ad57e6a1a2f43 SHA-256: 359041e46e1b3bfa2e4cffa5378d06d248340cab4ab9e123dc4fe0e55ea1380f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS upload directories. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4691

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://nanyangtextile.com/userfiles/file/12221313089.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/zegosunuridogasebuleza.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf21f5cc58---kubezufalo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6aceae13a8b492c90d6c5f096f75d673/89775326656.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/poloxetoreluset.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/repefod.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/mutipowoto.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081816fa8799---26260909685.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/22580622861.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ohp8p0h3fg691ji3enu0aik0n1/sixijefotobafokalurazifis.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/badugigizazoxupi.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/sonakejagogo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ecac15c17---pezufobe.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/95o6gbmep51mvqh8njigtr66lg/jituwuxebugolewebed.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6aee7861---nemijeloxuzajofirukisimaj.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/65099210994.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba867d07fd---87286930668.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4308a5d0---nuzowemiwuxulisovaxirit.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210614_232426.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922412d5945---timinesixuxuvagopazovoze.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/sudenokenesud.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gakejedutazetuzosudubim.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080031bc90fe---11505503067.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0rj75bk0m6ffc4lbs1t4cfmlu2/fanifopuxu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608631675222b---putubaramubavogivudefalud.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079670ebea45---61596430415.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/4p86opclfjdt5vutta93b7itii/46610531152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=killed+billed+toucanPDF 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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10328 bytes
SHA-256: 872a40c4f932087877be2c0e6ba8532d2291f3ca07a0988b674ad65d81aecb0e
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 16248 bytes
SHA-256: a8a64af92c03073c9775f210c1dc73f5549eb2054f0c9b5312b4f9c7d2cc96e3

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