Malicious PDF — malware analysis report

Static analysis result for SHA-256 1714fa906f1e81b6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 03:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02b55dffb85032b1503741df9425a43c SHA-1: e34a88d25d571125c5ef8eacecaf82497130f5bd SHA-256: 1714fa906f1e81b69f5f0e7c02852c6ced1f53fbcdabbd42b1c2a32c685faa71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and the presence of 'utm_term' parameters suggests a phishing or scam lure, likely attempting to trick users into downloading malware by posing as legitimate software. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=nitro+pdf+pro+64+bit+crack PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd72371c93b---porutamudaker.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bcatle1bcksuaq4tcndqfhji7r/zukezinekenovirudik.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/f7f9cd5adc2cfa71f2b06a2a7fd8ef0e/gelawawa.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/kokulemetotiborekivagabo.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/lesekorugimimoro.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/tivetuwumutomas.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074880897cc3---77151905383.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e25befe5---dajurezuvugavuzevazuguw.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kaluwimoduw.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/9145821070.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/ximosefuzifepadali.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da28762cfb6---pabimatazufizejexabe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gk0cj1orlpatqbji7t7uan49ba/xobevatepibolutugarofu.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/kiduzofe.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7620669aa1---nenijiwopoxonevakin.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607588a0b8504---xununidujikasitorax.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/9993479100.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49102b91cbffbe39d7adb9f21b7d73de/10236910846.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8c955f82bc8fb206242d9b96d41ce0b3/77149168247.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c34711a5f929044d4b9cca974b386417/lunepul.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac85978f0---ledikuletidutug.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8283ead72eb5e74656027ab5991139a9/vazokebeburi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc9fa25be---99456278548.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb046ebb0---72376958922.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9d2287689f2a2a06b67a170d051499d5/mugoxo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f9cafb50---wowebafizim.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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 10620 bytes
SHA-256: c590909833987f9a59657de5a008870d4803a6825aa4db9d00f308274fa2341f
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 17728 bytes
SHA-256: fb014404a08ad77099ebe4f59bbc8034880806ce222e41414ff1a2365573c368
font_02_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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