Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c7f359c6495c70…

MALICIOUS

PDF

77.4 KB Created: 2021-09-25 00:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22693f2bed6a78cfe284fce750bf2061 SHA-1: d008fe263034933305fc4bef8c3b6e92337b3270 SHA-256: b6c7f359c6495c70e4d14822769e9e53a3559a80b456c03fad1626d59fbf4b25
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of JavaScript indicates potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+to+retrieve+photos+from+gallery+android PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9a05ca00cffe6efbbf132e54b5a2df27/tubawimafufusobino.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/pidamanimudemunikegapes.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/zupoputurozogetuxupaxem.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/marimazimagapat.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/totuzikeb.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pozidopododiremetokediw.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/47365956394.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/17236903996.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/43335646881.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64652614311.pdfIn PDF document text
    • https://penzion-palice.cz/content/bajolawelivopuvujetokogez.pdfIn PDF document text
    • http://opersan.com/file/49552973170.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1b38255be3fb02e8b99cc44213a9ed85/mudumubakebebupaz.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/99897781084.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614080007e7ca---99263309520.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zemanim.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/tumabegexuwupolalit.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/7217795064.pdfIn PDF document text
    • http://ping-property.com/user_img/files/zusivekujifupase.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/88749810862.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/jinerujizon.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/godezitonexupi.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/14471504587.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/37858400515.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/20381904926.pdfIn PDF document text
    • http://underbutter.cz/download/foto/34400216564.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_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 11200 bytes
SHA-256: da9c202ac8ab8340704f418012f64c8ce24d2b173b0980d26d8554c1c60c3df0
font_01_sfnt_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 19212 bytes
SHA-256: 749510fe37e7b3fc19e3ac983208d4cbbaceb22d944ba53c822da0f1141ecc98

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