Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bdc410b4170b47…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 14:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4be57dd4fe032a2a41c1f8fc26edf452 SHA-1: b850efe85ff30a3594560fabac584ae798f1e8fa SHA-256: 90bdc410b4170b47c065170e0a7405b92ba09e83189e15a22ed3b224bfe6476c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://homeuu.biz/upload/ckeditor/pages//files/lawuzinebakudo.pdf In PDF document text
    • http://buydecor.ru/uploads/files/fisopolajajudenebis.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/12394413739.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4e1ba2580b5eda291a45c54f893a7719/42695602296.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1e31289ce---gefodajuvegoratid.pdfIn PDF document text
    • http://aquafilling.com/userfiles/file/97524648423.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/29757983607.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/53338599474.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fcdba5bf75179a462f5ab461922bc3a3/76644168991.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5416d2e9---bumiroforojisotexa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//madopubasasagunowim.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/vakodawu.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/65145736356.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/tivibesizimomufubafiw.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a7cf43cd3821f3ab5659e180423ae1c7/99881791575.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bjvpm4ffvd70jq2837ctges6g2/wokuwebenujofazex.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/37109802266.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/31b893ff67439f96be17ba8392217d57/91235839732.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078193112c71---tevadatewejefifizixabuba.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/bironixozipikuvemikaniv.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/satimalavesefuzigodi.pdfIn PDF document text
    • https://cristalensi.com/public/File/wijukewokiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=emotionally+focused+family+therapy+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ce12527cd2c57f50fe9a2be690d07e3c/mimodijatur.pdfIn PDF document text
    • 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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 18428 bytes
SHA-256: a574349f23ff49e20c98caa0964bdefc7101bc3328592dc208d5f7a27a9855b6
font_02_sfnt_off00012ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 11084 bytes
SHA-256: 5c788e2f39a0e6e5465f14f2c967281349d8ee2bbbd71753c5031357b7bea6fb

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