Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9997ad73b9cfcd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 14:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5946f3ced566b43e42b50c4e2dc7ba76 SHA-1: 2e3876f394b5b72d6e80d5f16258d4528c588d1f SHA-256: 3b9997ad73b9cfcd40ecbb757cb06aac06738bf129f4f781bd801f8445993163
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to PDF files hosted on compromised WordPress sites. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using compromised infrastructure to host malicious content. The embedded JavaScript likely facilitates the redirection or download of these malicious files, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6dfcc2896---53006206641.pdf In PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/godirebiniroto.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/13520893419.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/856qfhlureokgt4iua4ppe0do2/72718179265.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/dapibukipuden.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jodenimilexek.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/laredojudoniseguxabij.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/46270098425.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/78786027189.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/lijogarugotidonetivisoxo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/latalugibow.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/39861421813.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/vovuxitumabuj.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce6369b57---xutolesodiluteruw.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613476cb4b1f4---86263040389.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210922191913.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/34866680156.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/77973111507.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/48739914821.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_4B1D5EE978FEF1C7.pdfIn PDF document text
    • http://halaljones.com/uploads/files/73396383755.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gibawibegojopi.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/julumebinozaforakaruv.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xodabatirijizojirod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+scan+a+qr+code+on+my+android+phonePDF 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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 10972 bytes
SHA-256: 85ce7ab179955dd351c4838e8a2b9a2849fa631f2cb928fafea7a271804ddf8d
font_01_sfnt_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 18356 bytes
SHA-256: 9e4bf6e53d0b32a3b7ad0bb5c8e7ddb8ac5f6bc6fefd79dd493f2ce37fac3e6c
font_02_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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