Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce5caab22722673…

MALICIOUS

PDF

81.8 KB Created: 2021-08-12 22:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f53dabf6c99c902f0d10d167b4b69ddf SHA-1: c2179305c4a6dbb11bd7e00eadd7ea3d3c68d603 SHA-256: 5ce5caab22722673c0b36087d9fa130dafab590b4fb3d7e283b821c9c08d26ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8097

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mineraux-et-lithotherapie.fr/ckeditor/upload/files/sagiratekajiranozovud.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce72e69718dbe7944746047835b41bfe/tijadivenaxidunuzixas.pdf
    • http://esoftland.com/userfiles/file/megakudoxaju.pdf
    • http://dribblebar.pl/userfiles/file/7272308698.pdf
    • http://brilspa.ro/userfiles/file///45666058776.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/22962074400.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/jerokikibemumamoxu.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/11866151180.pdf
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/famabonuse.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56d13d923d---69335765670.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/xoxinero.pdf
    • http://amoy-art.com/Upload/file/bodarob.pdf
    • https://cristalensi.com/public/File/44495439044.pdf
    • http://abwingsva.com/uploads/files/dadepokiwo.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/25005126726.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7151a261---27795797148.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c434e9e5f269b11e972cc035360a8469/26212600779.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e78ec1218---jofirisiguk.pdf
    • http://goozzl.com/userfiles/files/wotimexulexanorafonur.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a2e0cf45---61817359561.pdf
    • http://rogersdesignhouse.com/uploads/files/97423448803.pdf
    • http://alexlunacoach.com/img/editor/file/1487159709.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1e47d289---kisinixuz.pdf
    • http://h-st.nl/bestanden/files/xugojenavukupufanokexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=control+systems+engineering+7th+edition+nise
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ab.bin
6c3cc36c0638885ce5bb2031f7121764eadabb007f6ead78fee0e3c540fa112d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 17432 bytes
font_01_sfnt_off00011e8d.bin
5bc8916cec6b656417c643fb24a1ced71c0fdfc9eceb9c6ed284e81555248517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10728 bytes

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