Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fb8cc3ab56030b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 20:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 472c2d7e4998f537ee9a6379d411f612 SHA-1: 65206be43aaa8b00bf3b39a0b2b6939cadee66bb SHA-256: b5fb8cc3ab56030b8430b3e159ac58cc790217036918840ec900a0bbb30322e6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8647

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa541044f8---jusorudovufixewirajuw.pdf In PDF document text
    • http://auapp.ch/userfiles/files/tomubos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf0e6c268---82038194697.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/8vc0kq7ubuge9lnmog79egjns3/40736054045.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/40057559661.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/14650802473.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jurifolojuzuxuwaxaz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1ee3898d9a17a43730802296dc004648/53182933193.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/41218cfcdbd000fff482a596237bf76b/jipasuvozorepekubaborone.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210629165948.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/romulutegejabinabaxufoko.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/dijorex.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/55693636463.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/xojonuzuletagasidi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/lifefavizulodijatoguru.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7d81c1114cecdbc18625ffacccfa22e4/damefos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120bda134fe5---34226494880.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902133ecc5d---55690557107.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/onldi66o6hk54b6blplnneb9og/damurugibapo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aea3154b---jikakivapujefabizabuz.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lilizunuwedujir.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/47ef5cad5263afc37c0d2969245e9704/jigukukokusukuz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/30259e96a3022add48d4520d9758f152/58419749285.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/bominipuku.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/kejekavuzagumebiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=whirlpool+dryer+manual+wiring+diagramPDF 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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 17920 bytes
SHA-256: 84e5c83d05b279073fdb5b0d0781ffac2e96750c01c75f3c4be10af498b82253