Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd75fda92b802f4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 01:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62d442660ee97a665df0a0974be0489f SHA-1: 36db38bbd66cef4d3ca5f8c45d98ab55c8213550 SHA-256: 3cd75fda92b802f4f1091361e168c95cf58c717b96110cac941809e21f8bc0bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised CMS upload directories. These links form a link farm, likely intended to redirect users to phishing or malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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
  • 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 https://detskeihriska.eu/ckfinder/userfiles/files/mavukedozalixixiburu.pdf In PDF document text
    • https://essuances.com/ckfinder/userfiles/files/26836351856.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/76312688008.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/75673798780.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/88788917006.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/sobosolodi.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/welanotuxotivud.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/95306494669.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/kinuxes.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/pijepenu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefobizefitosi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b000ee4bb8---15143598882.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/90660573748.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/8243687118.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/112296132.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/81877184193.pdfIn PDF document text
    • http://storemisr.com/uploads/files/vijebowevin.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/baccd263fc90b7dd1fa987a987f21ca4/85379536620.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/83279808811.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexeboso.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/501970622.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/34672250123.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a253cca1ac---nufalulixosidurex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+see+who+has+visited+my+instagramPDF 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_off0000b5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE8 11028 bytes
SHA-256: 2727e5c3e1fd45bd1bb581eba34447d9836096c9cc04a0a9a59410d2f37ff257
font_02_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 18408 bytes
SHA-256: 9df9683661ac91e90ed588ebd908c511ec396ee882dada94560031f2441c60c7

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