Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cdf9e3a091bcf2…

MALICIOUS

PDF

79.9 KB Created: 2021-06-13 05:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9c0551895692d9c7a5f613e43eb3a9ca SHA-1: 199799a3992f4ef55ebf03fe240b7a4ae46cd4dc SHA-256: 50cdf9e3a091bcf2e4a4829883a6d39b8f9b916c47060b872550418b6022cf2a
164 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including multiple heuristic firings related to compromised CMS upload links and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' lure suggests the document is designed to trick users into downloading a secondary payload, likely hosted on one of the numerous linked compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=mama%2527s+hand+queen+naija+mp3+download PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5ea0e1d3b017c163e239bad8c997f1a0/83029953682.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539742031a---fagoder.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/79629346822.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cee99a9665009690ec552a9c72cc6e29/8521169244.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8a57582ad0b13c3e1ad7f0e1e70e761b/didixamirok.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a497a6f2b---dimavisiseru.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b742ef85f90---mibelelime.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f6dq6s3a845s5818amdpe28q4r/befaxuwog.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/kifurivoletamofajolebi.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rr5d0k6rebsgntmgpnf0i8nob2/32992791745.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/75ea4cfe9909ae5c8637fcf3bc93393a/92248597745.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oqu2a3gpetcmupdhhcv7ov8b75/zetawinizuki.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/54858916081.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/45687042304.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/41506102285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33A 5600 bytes
SHA-256: 4863d30350447a59b8b1d6adf324857c2177c8744b1407d06c18ec7cc0c66ffa
font_01_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 2572 bytes
SHA-256: d994ce69c6f81b5c08c03ba562d2f706cf1769b4889cf810a7b22083d555bb26
font_02_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 12136 bytes
SHA-256: d1ccf72d85c5d001465eefa3b7553a472f915b9e7a3d84f26194b93854ae2fad
font_03_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16976 bytes
SHA-256: 4e858c34c6048414f58b94e08f83c6885b64ffd2a5d6c0f13885012a532c791c

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