Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceeb4458248316f7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 03:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b409a8ed7ba3613af16b0c3a85336397 SHA-1: 23f9bed895be7a52cf2193803706d16896db2ca9 SHA-256: ceeb4458248316f7f94931d1bb7de11ddb37acce71b49fb37bba7ed5bd3b7671
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a link farm that includes URLs pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of a visual download button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.predia.cz/userfiles/file/57561302170.pdf In PDF document text
    • http://www.keizerco.nl/userFiles/file/pagubavedeke.pdfIn PDF document text
    • http://beta-rc.com/upload/files/86613574856.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/6325274395.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/lukeliteranovisasuga.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/86402666331.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/bonukesununasoda.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/lotulazoke.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/gukafam.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f848b66ee0---12442336089.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jokofiga.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/76681801477.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/bisifatigawu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7f81155e---jetezutemowuzef.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/16198076663.pdfIn PDF document text
    • http://askort.pl/Upload/file/xinajotigituwako.pdfIn PDF document text
    • http://balone.net/_upload/file///dagejapofafotedonobemat.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/gifudalokepexovuzobojis.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/kewotepomugefofujiroz.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jepesaleputepe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138376eebc8d---67183433220.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/mezovuvojinoxefusow.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/99907297497.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/radapitasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mulan+free+streaming+2020PDF link annotation
    • 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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10772 bytes
SHA-256: 05b308d2aa9a9e8298adf742bb64e1670ba13b85c5bf1d1304b84241d16a7683
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 18620 bytes
SHA-256: 6a3364ee0946bb2a82fab72ad9171648a17a974bbab043666654f05c3869ebda

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