Malicious PDF — malware analysis report

Static analysis result for SHA-256 693628940e70278f…

MALICIOUS

PDF

91.5 KB Created: 2021-08-10 08:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3819d5b60719e62a375fde3804bfeedb SHA-1: 2e00307a68ca5f811f2dcaf742dc9b8851f978b1 SHA-256: 693628940e70278f02d88bea58df4d9ec1d01e67a244b315da8ad3b06649a254
154 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7885

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 https://coretry.ru/uplcv?utm_term=blanche+knott+truly+tasteless+jokes+pdf+free PDF link annotation
    • https://anmimar.com/royal/userfiles/file/lepuxax.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/59930466496.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca49cbe8be---22786950474.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/68463039029.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/wotuxuvonebemifopubax.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ee308bbc---39890176194.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d63d863405a8c8b770f7857202bcbc05/zifefuwik.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/23350601318.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/78337256131.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06c6777f4---defalugoxupigewirabig.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7e2314d1edc5609fa63f40837ab1d235/piliz.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/37258489485.pdfIn PDF document text
    • http://winso.tw/userfiles/file/zevinebofibujuleb.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/33607677640.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/fd8facf48331015dfba474b563b5676e/zitodu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/konuwugodetudupi.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/kikepewujew.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cf67006980feb17ff311fdea0877c236/sirot.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/xilonagek.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a225c3eb7b4---tapavumexibi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8c11155c---34698038461.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae8e3d834---sufixesimog.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/e7485b00aa1cc5be2a4f7e9a3a210cbe/4678141326.pdfIn PDF document text
    • 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_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 17816 bytes
SHA-256: e3c47aaa114521fce7c9967e486bf2b432d3dbc4a789af7f31ea7fe6e179ffc4

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