Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12031ad42b350e6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 09:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0749ae7599c05001abdfb6fd2af1843 SHA-1: 46552fb647eab988a058e6d02add812a04794ba2 SHA-256: a12031ad42b350e6a9996d4746793d0d6947bbf7da900eda0fd33131a0fff5dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • 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 https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/255d81951095ac48411cdf3dd4e5c973/mogiliw.pdf In PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/zopilosozaduweze.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fuxapodirerukubev.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/11596339598.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd60834d5f---13291539836.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397081412c2---sububitenuselalexagoj.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/lizafiwosapolalu.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916230308.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a51e54f28---kigotozudofutejam.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/xubixewujam.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/pezurinejopobelupiviluni.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/puvibapizagukimuwut.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/87721769119.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/30323963119.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/9418394162.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/loxavivigetefibi.pdfIn PDF document text
    • https://umartravel.com/files/84506563902.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613db23f7b638---7624198015.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/mikoduvejet.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/vovafovugogenajaliril.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161424d1c02b8a---39097245692.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/powitureb.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/23744948851.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/35638483440.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/38188862069.pdfIn PDF document text
    • http://iknow.pl/files/file/pesaxubegabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=discord+qr+codePDF 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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 17744 bytes
SHA-256: 3a29155686d10d66e7e33daf97e73a6e94cdaa1940b1c9a2f7ffc5819309fea2
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10100 bytes
SHA-256: ab726dce3cdcaaa967701b52e36e27cd8223792cbe7e6a2e3209947bdab0d18e
font_02_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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