Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc26f70724a67846…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 08:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c9a9356431bc89ad71906065c0d5166 SHA-1: 9e11b7575d390ec37c965ea790b5f7ab441946ef SHA-256: bc26f70724a67846ab74d01aefc6f21bca153f42023b0677b9fb220e458dde3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to potentially compromised websites, including one hosted on a compromised WordPress upload storage. The presence of these links suggests the document is intended to redirect users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drxzhang.com/userfiles/file/10327799929.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b3i210vuqkdhq7ug68d1dltsd4/72857322950.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/zovatitilowegetaneni.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/pebawapo.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/98967164756.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be07bbc86aa---dotexedatu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0af7295d97---65975175422.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/89800776489.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc688ea2d---61293052318.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e887e048b2---3731146680.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6cb4r2uh95qci63oe017hn7es1/gijapolopipefi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb45a3e322f---dawerojamiropobisakup.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/rudogisigumepufosifat.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff0a4e530---3227460698.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/zibutevasinezawupu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4409p5chuuh0d5on805ebras8c/waxeziwedemiper.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9babbec56c---74282007685.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57475554245.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/db6c716d98e642b6cf7f67955a58f10e/47693780157.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2a11b53a---davajitajit.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/88967562533.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/bavurinobu.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/zulufutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=advanced+life+support+in+obstetrics+manual+pdfPDF 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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 11068 bytes
SHA-256: e665e3da31fc2e398abd7ab75bdd98f8ef33dc01c2eb34e92439366791f104d5
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 17852 bytes
SHA-256: 622fa17e0f1021406b71369e4d7d4b2592fcde09ec2f57874120036d4d2d9186

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