Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dc62586fcdbdbd…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 21:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 053d1a91b66f96d0643b83c780b0e502 SHA-1: 8c545bb79294b69c94ce37cffae9b5f59e48ab4c SHA-256: 30dc62586fcdbdbd46502453ab338bee7a55b365e8faa728d0feaebb8c7beeed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://stepweystudy.com/ckfinder/userfiles/files/sidimu.pdf In PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/sawatamidotalujojozujo.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/zetotewanatimito.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/57361488730.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/vosomazidizatugum.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/16702186158.pdfIn PDF document text
    • http://belovosushi.ru/files/tabetalir.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403496af364---95133189679.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/voxemixapinagowexisizap.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed98b0e2f---32911756322.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/dutoxajiwu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wulekadunixuvur.pdfIn PDF document text
    • https://kawanmto.com/contents/files/57388552845.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/22650889842.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161367b78abd88---60620033609.pdfIn PDF document text
    • http://njxinbell.com/upload/files/9321092251.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wonelowomasezazerexu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f38fcc061---66141275898.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed311cecd---fexixugesogojemimebe.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/suzufojex.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa00d4335d---fimugovinepazopivip.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b0413040---jefetekuruwi.pdfIn PDF document text
    • https://keongracun.org/contents/files/repunak.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/dopuv.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/84389563621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+ball+xenoverse+2+for+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_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 17128 bytes
SHA-256: 9baf303b2ffb09960318b01098db042ba54e8333db254805634812f0e8ea82c8
font_02_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10860 bytes
SHA-256: bd3f66eea467ad16625c39186ab6fb31e570fff5c4d7f0e66108e665de4a74f2

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