Malicious PDF — malware analysis report

Static analysis result for SHA-256 353b330af65762d0…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 22:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8a199d40571b316699b412fa3563b1cb SHA-1: 556405909a70fd84032604671f4c7df2aca6e400 SHA-256: 353b330af65762d0f2eaf20316acc659a4b91ea4dcbcc2d6ab68d529d0f0f53e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://synerhu.ru/uplcv?utm_term=call+of+duty+cold+war+hacks+free PDF link annotation
    • https://vinocastillo.hu/editor_up/zubamanulimameva.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/6532225368.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/50619731953.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/bovupawawipiki.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/butovasirikefukipubovoxik.pdfIn PDF document text
    • http://yljczl.com/uploadfile/2021090306192557.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/xukipukugudomuxuko.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/remisufozes.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/fijaledo.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/92971422756.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/zepifasamekogukutemewo.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/budemumin.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/mimubi.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/57655115068.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/13438112528.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/60951594085.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/kapusetometamolem.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/47552176360.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/4724064803.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136baacaf2c5---dotewozomiridonagup.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/54753441896.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ae8d987690a4521c9099a1cdafef774b/39669216143.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131818a913d5---togotebafigitofonesisivo.pdfIn 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://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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10800 bytes
SHA-256: d463f587a4b4587a4aa46786edb112d9aa960dd9a2b7d311d939494b3d6fa981
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 18348 bytes
SHA-256: e141b3de4c978283a9b3549c6b14b3c88741c3d0e81e1d9360d9cedb968609fd

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