Malicious PDF — malware analysis report

Static analysis result for SHA-256 232d3a94e3dea9f2…

MALICIOUS

PDF

68.3 KB Created: 2021-09-11 16:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 024719ccb1e3fe56c6d36a8c0bcd4d45 SHA-1: d89b1f0779dd94c0d2d3915ce28ef0ac3a77deab SHA-256: 232d3a94e3dea9f238bcd4c58de48ddd7507aab4ad27c290d76732d827f1a548
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://elskup.pl/images/assets/file/37727087973.pdf In PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/dolonox.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c807aa2d57---banujoxizuri.pdfIn PDF document text
    • http://weingut-suppan.at/files/kufolepuzeki.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/77779412327.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/56986998673.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/81649363639.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/85277100810.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210903191334.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/78083134816.pdfIn PDF document text
    • http://annabarons.lv/files/files/62848352372.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lumegukadita.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/batabalonekozafegob.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a011c9df4---90703164856.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/ripisaretasunijikajufepi.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/1023009181.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210904_8C5EBE3EF02BBD4F.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4q15jtoah6b7bpp16pk66sdn79/80377362082.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/57366380651.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/tudodulanokuwexusa.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/lurosunizozezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+video+wallpaper+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFF 10376 bytes
SHA-256: bc57ffbbc99b7b04e739dab5bbac7a2210c36f769a944effc21ad577d8b9950f
font_01_sfnt_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 14480 bytes
SHA-256: e83cee2702c4b5351bc8aaa9d462256b524c955487021b05b48d7fbe79281db4
font_02_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1