Malicious PDF — malware analysis report

Static analysis result for SHA-256 b946498a1310671f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 11:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25b41370b333b810919c77842e87efaf SHA-1: 502927d725309d5e998511c6e0ea901bc862f196 SHA-256: b946498a1310671fc1da2485fc4a0884aed85a25b4524664e7cd9360ca16b777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://smidgel.ru/uplcv?utm_term=cloud+atlas+novel+pdf PDF link annotation
    • http://liveisagenix.com/ckfinder/userfiles/files/digubo.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14597305532.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/85886716797.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109272011254137.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/93547974642.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6f7522aafc3eee6da90bd46937809ebe/89788554404.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/78859200142.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/85og6su6t9tu2tl6aldjvc1fdn/56829932390.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce7c7a6e7---wiviwopukogufadewupilepu.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16202467817.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/xedozedolomumatofim.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/nozimesixanexuporajatopi.pdfIn PDF document text
    • http://inspeq.eu/public/files/13163106619.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/zenofajameliziram.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1vmanqsun0fc03nu87er957pv7/56962013740.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011053501045.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/51606746522.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff380ca65f---79971972711.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/63905883272.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gb2lisqldcq1v4h2d7hhgrldro/77408894025.pdfIn PDF document text
    • https://ferropula.hr/files/fovemeriworebizanam.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e919e29f60---40975979788.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_off0000b8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C9 10496 bytes
SHA-256: e932cd8cdaf71e1172a0a6977f8f8583a51163c820642845ccb7ff9bf2936b46
font_01_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 19532 bytes
SHA-256: c1c4a66c45a31c853d457fcdc295ea7daefc17ad706132dba15551c60d302f1b
font_02_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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