Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9d5e241c5be5a0…

MALICIOUS

PDF

68.0 KB Created: 2021-09-07 09:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe662b02d01c2e1c3c56d94e3eed3c35 SHA-1: 0b3bd179db192b24b745961ba98507462f98abd8 SHA-256: ce9d5e241c5be5a04aa4fc3cbb8c4d748a89029aa5140d9840947231a1745f38
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly suggest a malicious intent to lure users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=solving+inequalities+and+interval+notation+worksheet PDF link annotation
    • http://msiutilities.biz/documents/33630009801.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/19290549685.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/wedoxaror.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021621926321034.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/risipovirenamuleraga.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/37cc0bb7d2748b9737090569652d9aba/63555285651.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b392a57aeb---12881859248.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd3689fa5---lulezaxal.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nmr9ggng4chbb3je22iqb91tk1/resapokopajolalom.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081399d12f05---gafodurenizikesox.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/lixatuzeduxanoxan.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/75488916324.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/wogurego.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a62fc9519---97529448836.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zejenolobavodisetudo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fujofujasojusikegesujawud.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/7618697436.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/lekofenawejedenowovikes.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/rorobomiwuvunujujuref.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/nijibodaziviwozobem.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609305b284182---fopigadexad.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_off0000aea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 11092 bytes
SHA-256: 48ffba3fa3e7d7a27cd0f5b9829c3c843467c1b81027940161a30ddfe80d205e
font_02_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 13924 bytes
SHA-256: fce0e843e27111a52d23748750d751b6accd31f1e417184f1ca2659ffa986ad5

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