Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2778c812af36412…

MALICIOUS

PDF

72.2 KB Created: 2021-09-03 20:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 495aa91c4c7782d30f1776772360417f SHA-1: 49eacaa0b53d4c44110907edf291bba635e2d911 SHA-256: c2778c812af36412900e562fa11aba90bc4a51d0acc888608ecf4533668e437f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document's structure as a link farm suggests an attempt to direct users to potentially malicious content or phishing pages.

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://ourpreferred.com/userfiles/files/ludoralexu.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611f79892c423---99405519540.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/85e5e4bb500a48bdf9ef268f617a1491/rawodise.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/telibidudanixiduxu.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/22497757553.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6fdac7db---13996002996.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/xuvejitivuvubive.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/417e0af9157f2aad860314bd8d1a9122/45167359217.pdfIn PDF document text
    • http://riph.pl/userfiles/file/lejofemurituvageseg.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/62550975613.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5ab1070867a1433ef1b6adccdae168ad/jejofadowufogakelovizol.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/40194216727.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880287aa0ba---95282960754.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/68172538587.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5d7e2bbf6bf801b5c5ae812899936e2b/zipawutajitibexek.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/mexalagewosuzizeku.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/nurupup.pdfIn PDF document text
    • https://coil.hk/upload/files/xupedazilemobed.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/47206116187.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/gelevodesenoxoboxe.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/diliwitujuz.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c2c0350dcd2860e4fc07e719cc88d3ac/12267938795.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a924e5aa5---gajofiravobisur.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8cee1ed5---vojuwujiwulogebutikik.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/15500933983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vigyan+bhairav+tantra+pdf+oshoPDF 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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 15900 bytes
SHA-256: 144900cbd97b4dc18e953c1f2430fc96c043bcb37c1dc86ef30b7186691aebcb
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 10888 bytes
SHA-256: bb19db992419fcedde84dcde297bd8009c54beac5e9f9946e13737b303204e9a
font_02_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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