Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abe02238ff12f8f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 22:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76c17504f8f8d850613e878491d47c56 SHA-1: dff71c14723d2c45a220a03b2216e32b413536b9 SHA-256: 9abe02238ff12f8fa8c0fba6227c7524b7e8380b91756cba53e65636c166a115
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage. The heuristics indicate a lure for browser extension installation and a payment redirection scam, suggesting a social engineering attack to trick users into downloading further malicious content. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://budropol.de/Upload/file/11064304295.pdf In PDF document text
    • https://mekongtransport.com/upload/userfiles/files/gaburap.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xusodutin.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/mokirugaga.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/40033068290.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/buzipuso.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ed3daa4---fitatanomudowufetajuk.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/dibenewufexolegepukejudaz.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/bidumoru.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0a10d9e1b95d73e5a97f7d3d5bea970d/74725832940.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161358628a6b51---39343705602.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/50812878427.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/5709157037.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/40456609289.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27fd0dfb44502c3aec09fa8210680f3f/93191771916.pdfIn PDF document text
    • https://semut73.com/contents/files/vudukorezajatifa.pdfIn PDF document text
    • http://hidramaco.com/files/files/92324823232.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/75077077698.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/46187636337.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/96782947592.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/2698800057.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/24388834493.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/98405164510.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/zejukadoduzeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+chrome+mac+os+xPDF 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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 17332 bytes
SHA-256: 3d9982666684a6cbf9292421e68f3ee6111579852fc2ec93dba1d698061090f3
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10636 bytes
SHA-256: 477660f08bb1f1daa9b05aa887928bbd6a854a764c47776bc963b2ef7a307974
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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