Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb524a1d5ddde6b3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 04:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03e0de1eba59f41d59a237f26a24adb0 SHA-1: e397b316fdf59076fe14b70d72f19ffdaa1b484f SHA-256: eb524a1d5ddde6b370f46b05bdab286ef96a1d128a3fcb7112b2a3893b201856
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+much+calories+is+in+a+mcflurry PDF link annotation
    • https://2acontractor.it/images/file/fugovokirovozalikoxip.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/96878643571.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/96130481508.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8836d17f64624e2004b07fa4b562da7b/32161705353.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/lawilurejisizo.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/66852527992.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210911_135500.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/momowige.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/40273209147.pdfIn PDF document text
    • http://groupkaishan.com/d/files/38270644566.pdfIn PDF document text
    • https://service-panev.com/userfiles/25258048929.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/3685880700.pdfIn PDF document text
    • http://isvpro.com/custom/files/45135030045.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/sumigigexazarejin.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210901_089A44E838E69216.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/tuwaxifuzu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/29ef166130ef399308a579d27f4ff87c/56360805510.pdfIn PDF document text
    • http://cwesp.biz/upload/file/vosipipaxovekinefeden.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/62430791196.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/upljopca1u1ticaa7oae6h35m7/muxutuligalijesej.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/kiloxabomatomolu.pdfIn PDF document text
    • http://373113.linker.tw/files/bejepedoluwazume.pdfIn PDF document text
    • http://kyea.org/imageuploads/fenapir.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/tetij.pdfIn PDF document text
    • http://tradotel-riviera.com/file/sitalepunexajixokoju.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/76540277564.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 17808 bytes
SHA-256: 7fb762e868ec9fc30cd1d62a939ed78d188ccb118b486e858b596fa3dab1938e
font_01_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 10796 bytes
SHA-256: 3df3016da64c7de56f4eb7f1a26bfaa3b486c7e3b29746df284e37d0137bdf80

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