Malicious PDF — malware analysis report

Static analysis result for SHA-256 909c01f9e57fa749…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 03:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc3cf2a60f5583d14cdb0e61ff7388ad SHA-1: a83c413c0173b0d9c14a9c61fe4a3fdca64d2876 SHA-256: 909c01f9e57fa7493b1a1ac470e4c91b3c6d344f22312bcbfdda51be5773bcaf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also features a link farm pointing to various PDF files hosted on compromised WordPress sites and disposable domains, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • 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://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/vepuxekapowifutu.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161375f212e308---piloluwatubekafazoforere.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/28891018719.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/dubapimuvuwib.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gimn8qo1cm8e4vguiinfvkphhn/55390469968.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/21491967151.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dbb24aadd---69254926774.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/dibuxulugimem.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/lozibuxomupetakarulotaka.pdfIn PDF document text
    • http://taigesw.com/upload/files/8435574066.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/numowagugorujataxo.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/5731254377.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/kezifovesaxofobulig.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/wugogo.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/gekonod.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/53832515693.pdfIn PDF document text
    • https://ijpdua.com/contents/files/domuxutuwijugalomeno.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/63975741180.pdfIn PDF document text
    • http://pasaru.com/upload/files/jekulebemanusi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612fe0053ce58---sebujaxe.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/mavuwopulom.pdfIn PDF document text
    • https://scalping.ir/data/files/file/juwiwosav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=colour+switch+unblockedPDF 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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 10756 bytes
SHA-256: f608bcd79026acd383ea7c6b1d72cccb9cafa2858fb5c6cd2d6c1bf04858f617
font_01_sfnt_off0000d036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 16276 bytes
SHA-256: 009f47afdde1dd308249ee30c5635ce82c7116bce86a2bd4386b348f64bfe421

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