Malicious PDF — malware analysis report

Static analysis result for SHA-256 696980cdc7515838…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 12:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8a982c53295e1aa9e98674118bc943e SHA-1: 28d18f8f0d66e6134034522a1a25a436da0445a0 SHA-256: 696980cdc7515838bec781627908626cc91af20f894c6ecdaf81d501f2b29c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via web redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=top+10+tablet+games PDF link annotation
    • http://icoenergia.com/userfiles/files/bukixulunasesilifugu.pdfIn PDF document text
    • http://dobermanncz.eu/files/sajagivino.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd02056c2e---zitetegofofowesokowujufal.pdfIn PDF document text
    • http://skolky.info/foto/images/file/73697784687.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e4acd16b37edc4c06ea5acaa62e5ebb0/76777553464.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/wezezejikurusepap.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/wufexewuzipejipe.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/resoso.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/89446079388.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/d546gpioltc02gh25fjjmr65e5/69941792333.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hl6bmu62b13cp5c7etkhavjn8c/21333415812.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fuxirebefaxulog.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241843641c---35416889993.pdfIn PDF document text
    • http://hainfelderteich.at/xaniporufenavulalibo.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109031431347416.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/7818281067.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/geguguwej.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zoziwaj.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/59764873683.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba4a8632b---94946306518.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/ripadokoj.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/2881497461.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/weruvubop.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/39172322453.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4650ebf6f---petevizusezefonexogapubo.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kewawutofusepopafesewonan.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/vupodabozotumifagu.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_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 17012 bytes
SHA-256: def5f41391dd3bb6a0f7362b5cd503b0218b0039ff01622128bd174de17e7e3f
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 10576 bytes
SHA-256: c3dc5fc63968b700661703b0606565cf7131caf09e9a5b9be6343528586d173e
font_02_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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