Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc85dc87424882…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 19:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47f96c5d9495c060884ae4bf75b8e9ea SHA-1: 507d7b4dde9784668e4e509aa62a3099ec103b40 SHA-256: 10fc85dc8742488282750db94f405123bf885da7789096b42ae6513a6f5d24e9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 https://medvor.ru/uplcv?utm_term=vegas+crime+sim+mod+apk PDF link annotation
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/46677147482.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb0d3173b---97583850652.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9d246a34---gotubus.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/30026515019.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/15381881274.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/33117999507.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210910002125.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/27676444519.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/80247563681.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613922b6d1b05---kobuwetonimaluze.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///30341255.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/teseje.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/53253311335.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea6974989---95312536040.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/zuguwirobujelusemuri.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/6293066410.pdfIn PDF document text
    • http://www.centralperdana.com/file/78173335719.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/42197476877.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/23776437299.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/8135485020.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/kagurupavofefopemomepu.pdfIn PDF document text
    • http://machin.kr/userData/board/file/vikab.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16820 bytes
SHA-256: 5cbb6214375cd4afc7a1a77aa583e53b2ad439b5ff3c8e5395a16157893bcdbd
font_01_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10668 bytes
SHA-256: df4eba9c3c966852e21f06d22339f1057586971b5f6f77c30f497228d079987c

Open this report in the interactive analyzer, or submit your own file for analysis.