Malicious PDF — malware analysis report

Static analysis result for SHA-256 82af22cbbc648ce3…

MALICIOUS

PDF

79.7 KB Created: 2021-06-27 21:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79063053571c860671fd754ca558dde2 SHA-1: 6509aa1c698264ecf05220fb709a6f48995952f5 SHA-256: 82af22cbbc648ce34e0e93d0275aea8099fe8dbf74a68cadcbaa874e7794e922
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, a common technique for hosting malicious files. ClamAV detected this file as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent. The embedded URLs are likely used to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c4f52dilhpn32po8kduvtmn697/8794628616.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb8d31c16---kigelaxewuronaxi.pdfIn PDF document text
    • https://2acontractor.it/images/file/88908388785.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d078db75e5e---82637176134.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54f63b996---31243241228.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eec23197fdcfe7f2be1967d4395ead1d/67371470659.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fitilu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/49252822765.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ae071e8f---87045139134.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e22edbe587031a778b012e6b9852698d/gituvinevepefesitil.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/52236164902.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/11223098534.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/fufamaxobip.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee71905a41---punutonarixufukerofum.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e3e20b3179dd026cfe7022fa3698e7fc/tuzepizimekef.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78907381c---8168898799.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66bd37920---84360300494.pdfIn PDF document text
    • https://le27.fr/docs/file/zomuxalexi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p21udd716hulc74tla2up716h0/fewuvepijigezosadafaxu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/df70198b1f4a50b38273b4ada725ca4e/lawipa.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/sapiwasufizes.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jqriqsrqq0hvdcu7s5m7d2213/57364397395.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/varozib.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/6qjkmmtdjt7tctclmuhv7be8q7/67066387685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=calorie+count+per+day+to+lose+weightPDF 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_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 16580 bytes
SHA-256: a72cf74b41860529ea02794b046f2d7ab3cbe5b17c60bf6ce11104b867ee6fe2
font_01_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 11124 bytes
SHA-256: 6730be2db74dd5d690d70c05d213a93dcbbd83d5be01941d0d70a4ff6f4ab413