Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6662f531bac5e33…

MALICIOUS

PDF

88.4 KB Created: 2021-09-11 04:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1990a2c648d40aa9d49e17cd635cfa6c SHA-1: 426b587a7617f3e1d91346a1a48c213c3b08f764 SHA-256: f6662f531bac5e33f7e303e0a36506b4a72f492fab2cc201a693ad75b6f0b077
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kryotherapie.net/neu/userfiles/file/pevijikojeduvumexu.pdf In PDF document text
    • https://exihomes.com/userfiles/files/mafusofi.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/266836868.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/15274661518.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/28484704225.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/80965328745.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/34624100997.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/71277156453.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/karuviduxizinumopalisovij.pdfIn PDF document text
    • https://onwater.my/uploads/file/95876400800.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c3aef923---vinomubo.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/zirapavinuruwiwudexe.pdfIn PDF document text
    • http://nincity.de/inline/file/54802317348.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb23cf586---11814851195.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jolukamepev.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/midofudagofiniwimonebeja.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_6C98065D7E2E4300.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/67456783976.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131630a8ce09---deravofiwanokusidowanu.pdfIn PDF document text
    • https://red-adlay.com/upload/files/75155087751.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/49152887503.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e36a69b24---lapukogepubix.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d251f3d2---74177504024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=john+cleland+fanny+hill+pdfPDF 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_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 10456 bytes
SHA-256: 8c4128f2eb73664a7d411ffa0894e1fd8b6a2e342c93281d6275b34c662d859a
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 19072 bytes
SHA-256: 5094cda6e8be601efe7d82c446c15e74c447fd5d08b4c577375c273854e48ae0
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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