Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbad488884e9e6f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 22:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54f6e05e744755e459213819b0eda74a SHA-1: 86ac1553966b69344c7e00f5a3b3b8cefb50ffb9 SHA-256: cbbad488884e9e6f7a290b73d3b45c6027836c1868f5af399b84f253a7bef095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://sevennews.com.br/ckfinder/userfiles/files/ripesutotazogipesidizo.pdf In PDF document text
    • http://glotecgh.com/upload/editor/file/gupevador.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/finejafinuvotil.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/66350436254.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/nemunomegupuj.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524c07b7c3---7588555232.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/74926638636.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/mukiwonasijejedepixeweke.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/70057187520.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/bibujozunes.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/20914955172.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/98003791159.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed2a9c4bc---sulafuwufeninejud.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/vijadisinibasolitodenus.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xafevefupajogisoxobujif.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/solenesedere.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a46d6dc3---97215860960.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/55905690773.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd250b4aeb---fefazutoxobax.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/folozemewekak.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/27648944446.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160825d80123ac---25947288357.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/38015063332.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/45101111818.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/26420464593.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0664u7qa94n0fmr0qnhgnc4ml4/22207417325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+himnario+metodista+pentecostal+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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 18708 bytes
SHA-256: 3d405fe71f9c78b57e5f470e4bbdefb1fd4b6eded9eeb8502d45e02d2781b504
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 11068 bytes
SHA-256: 9fb466857ef35df26e2d58b9cd09fd1e23740803c42505e7a411876ff6e2df10