Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9d5226676204ca…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 16:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e5719755f3d3940b0e1855b031b54c7 SHA-1: 0b56793f81843f17076f23fa57034a42628b96e5 SHA-256: 4b9d5226676204cae4846a79242e87c131ce414cfe2e0544165b56aa989d79f8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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://wastran.ru/uplcv?utm_term=ifrs+8+pdf+deutsch PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2c2a7c54---30570313966.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fonaduto.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/xupagota.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/45825607761.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/77780438803.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/melemoronodepoz.pdfIn PDF document text
    • https://o-dance.com/upload/files/wunugatozugad.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/iabctsocnlu5nm8qs4c4gkpg36/32922832495.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/1079194560.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/votulijidu.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/megovujuf.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608731480d442---mofefa.pdfIn PDF document text
    • https://kham.vn/userfiles/file/1718395961.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/3622098896.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/vefowotamus.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pufufibadopapix.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/debuwitunugegare.pdfIn PDF document text
    • https://songhongresort.com/img/files/333345366.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/totapekatuvudusevaroj.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/77223731304.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lilorukoniwulokonuvodul.pdfIn PDF document text
    • https://tepihtrava.rs//files/46020566347.pdfIn PDF document text
    • 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_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 18284 bytes
SHA-256: 3ffa7ddce27ec5ae7b1a36859e88ae5d707c355f851561a76abcc6b916a818d3
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 10452 bytes
SHA-256: b89e5a7ad69a29abc2cf239c3aaf795e8c800da5a71a490fc468212dffb3d325

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