Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7448e347c13580…

MALICIOUS

PDF

91.2 KB Created: 2021-06-28 06:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 187329ab32cca5ef20414f195101b8ac SHA-1: eed81cbdb1a4f10c02248532d185cb9c63091f9c SHA-256: 8e7448e347c135800f4ba5301be5ec1455e32778d62d121a9f02119d2afad39e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/66fb61f68c876fd7650b057f382d6eb5/sanifelew.pdf In PDF document text
    • https://hanahana.vn/media/ftp/file/15568080082.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/83594763973.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ee84295e---makuvozore.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2d06524bbf7e9c0818703285661732d3/38047937677.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/nisuraradigaxejupuluj.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/1759557929.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/58916351825.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81a03bf82---jelusudozujuk.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/49529736515.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ecb34965445395f03f4fb2a63921be5f/lokejumulezopil.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pmuuoss2e3h2ns63u9pc3kcr47/lisidapafotenixasikemaz.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/rosazulo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a5ff32491d16457d9a3c99fb383b6ea7/sakiketa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beda13e87c9---26118846580.pdfIn PDF document text
    • http://4bx.pl/public/file/rabuto.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89cf25269---19597743644.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/54496149411.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5b65d035---wetujutewadu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6597f35de---folugabasaxodewepamidikal.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6e65bd1da---90151063449.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/rujel.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/nelore.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a921ffee---zawonodekudupudimo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7d16acc7---dukefedoweraxexekivuxipu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/645e2d0eb9b15579c3c1f6110b6ac138/221972157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+croods+agePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b74314ae---ragujozofuwetalasude.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_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 10272 bytes
SHA-256: 8921d845aff46047de2ed3b0a8755b37b8a4e31dc4b94aa6a6c9bf8d2c5299b8
font_02_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 17212 bytes
SHA-256: ec5e1c1b58892ea7921c8136f9f7f71b7b186ba34605575996b250d00eaaf0ba

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