Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8b5e46dd0a79c9…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 13:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 67fb82f7ec4e052a3a98d10841561874 SHA-1: 2c1b5a8e374ce02b911c88bdf440d9aee94d35e7 SHA-256: ef8b5e46dd0a79c9658bd3d7e772c3141cdb595257bfdba0be67a2d5ad8493ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://cnhhgj.com/upfiles/userfiles/file/38777170416.pdf In PDF document text
    • https://protrialse.eu/files/files/milimorinoda.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gelexupagulixexet.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/ginorokaburajiwurato.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726940d6341---sodovobin.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/doxozegazuzidezezo.pdfIn PDF document text
    • http://tayles.com/uploaded/jeruvulupinepo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/53040254552.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f363455ca---99404830157.pdfIn PDF document text
    • http://groupkaishan.com/d/files/90625259774.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2mvdshbeke77kcot3i5jgjl4vg/pinis.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74329be10---vapetovulapagepam.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/27084530940.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81152d27b7eaa5e51f4413826dab96a3/41060741287.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/76883943614.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082adf817b1c---wetipumajem.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/veluxidofa.pdfIn PDF document text
    • http://nenorm.com/files/files/magikizu.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/57703750810.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b647d29ea03---bugorapepenot.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/93ae1cf47033f37bf5b09eaa28d8e11b/zademewekewepa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1e2914c9---23723834697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kawai+digital+piano+es110+manualPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/12683754929.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_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10984 bytes
SHA-256: 873cdbbd33160f9e59b2dc2b0f119f35d4de0a4281837c59a2212649ecf3b467
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 20424 bytes
SHA-256: 2c7bf9b701868f51a284002987b1d51d1da505e136dcfc189d366ccbfa4f87b8
font_02_sfnt_off00015830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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