Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9083c8f9ecd7a1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1492b430a53002b9c44a3d5dae28a79e SHA-1: f8d7c87b91a38d4e2160ac30280eaf2bc0077e4c SHA-256: 0e9083c8f9ecd7a108c78597b225552c17a7c98a03d50472e8d7fdefb977ebcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gilboamedia.com/userfiles/file/99959361378.pdf In PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/depoxenomabaliwuk.pdfIn PDF document text
    • http://klhl.com/userfiles/file/vozutevel.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/nipumosufume.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/90804664981.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/83307648940.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/fazinovajudu.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/budasavatu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161425c81cb6b9---24126012980.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ca212c99a---96867387737.pdfIn PDF document text
    • http://newworldss.com/uploads/file/4867646949.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/58439584556.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/33954616309.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/63936879532.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/kadifi.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/fupimiwabupuwubenitetera.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/vezixutaxowasoxal.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/62048338036.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcebf54f24---vuwujipo.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/sapote.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/74061048612.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gelojufegi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144877ced027---fagusof.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/7719637758.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/tewagulibexuzegezadezavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+5+for+tabletPDF 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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 14452 bytes
SHA-256: 02ec5a400c779753aa2447adfaa7f9ea0974620d8f438d13167da78f06d5f7ee
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10156 bytes
SHA-256: 7728b06267bcfea8161227b8eb31397323fecb231bc4ebdccdc8bdf00e7a309d

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