Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f92f2e9e6a70f4…

MALICIOUS

PDF

80.3 KB Created: 2021-07-29 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1e3399744bf44e54cb4c493352aa0ee SHA-1: 91324708e268a034e5f5442439e8e7ebad896ba8 SHA-256: d4f92f2e9e6a70f4d51a0acb2589f2f4e013cb0122709ff50cc8a0ceb3e10357
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an exploitation attempt, possibly leading to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

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://chcial.ru/uplcv?utm_term=minecraft+apk+softonic+download+for+pc+windows+7+free PDF link annotation
    • http://imailbox.nl/images/uploadedimages/file/xufiwuxixulafagexu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b023ab9de6cbfd06c20a7d828672c4f7/najedo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/abbe3bb362dcb4f2cc88ef97880c09fa/27901712071.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/61332973293.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/df0f3b13e9cdd4e0f50c4bfe60603cc9/lolipoxanasejo.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210714131548.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160729361743b0---sipubuladaxekavot.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/bezarajelavitulejoves.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af94eba2543---vepemusupezowamuzula.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4acdc4d193d77370323267aede442832/62130342336.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/78930186524.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/wexiwud.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/jizegatibifijitusodunukof.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607746ca8dc89---13190115003.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160881710eac81---gozipuzuvilijato.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/62599615414.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/stlp7qoj543n97fevhohsvk9fv/vuwamebemavojaw.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160739f5f3ddb4---bawojosetadibofenojalus.pdfIn PDF document text
    • http://frigosztufi.ro/ckfinder/userfiles/files/xoletive.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d26b3a1cebe---tawapabuv.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/muverademofejab.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/28161400277.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c109f2ae802---jinexuvajesunedileruwuwo.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_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16368 bytes
SHA-256: 20b0f0df0ce217d2d9ab4f757f9cbc307f3892c08392b4d07caf1e8f9319537c
font_01_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10832 bytes
SHA-256: 742670f81a657e90ac82e042b40a7fe1b46b6b0e82ca7d8102695f9590891bf2