Malicious PDF — malware analysis report

Static analysis result for SHA-256 90203091845c484c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 08:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7aa2746437ee9419fed5ddf770c3135e SHA-1: 91b9bba40bd48bbd1d5f56a736c61d22f845016e SHA-256: 90203091845c484caa43725c342e39558308d55c59843e6778d1a18a8e3ecb12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, pointing to compromised CMS uploads and disposable hosting, likely to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself facilitates redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c01c9369f---zemewijazonuxifusi.pdf In PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/15788116560.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/vukir.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/42748483236.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/52829641350.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/84835566100.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/lojumakedeki.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/67296464845.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wijawizulububajadasomed.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/fojiwudujigumitamujituvip.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/46376944203.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/vuvapor.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/soxawuwilozefitaxoveku.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/16017089303.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/luzejekuxolez.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/42935260383.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140721f1341a---40604541971.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/dobilanomoxomamadigizufop.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/wofapeloturowelel.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/73289686018.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/18190348928.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/4652243275.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gerezoxegepajosumegovax.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ce9348491---fidutezanoludafosamofu.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/54100905530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+check+signal+strength+on+androidPDF 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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 17920 bytes
SHA-256: 17f9285e82310d4c9e7f8ccabf3bf13498e93faef99482d4e73e5982f9f12b96
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 10820 bytes
SHA-256: 7231196f6a24cbf9d25f668074dcf9a85fe189cecec4a533cada5c22ecf07625
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1