Malicious PDF — malware analysis report

Static analysis result for SHA-256 917d43cb3954b479…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 17:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92f9b958da6e02a4adfac8a0e5eb460a SHA-1: d4b7fe633e6e10faad2f5796cd0fe80e3339abdd SHA-256: 917d43cb3954b4793633b9c5e19b8206281324ceb50df1d6181cabea4c14f393
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to download sites, as indicated by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/sefogiz.pdf In PDF document text
    • http://31kouqiang.com/userfiles/file/1632863992.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/fivuluxigopidovu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e0481190---pevuxilisofajoluzoti.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/79812237956.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d6aa271f5---76905847855.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/kekekatu.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/77520778366.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/67364705308.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/35295825823.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/393236200.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/gonasojumuw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b56d0cafc1---36353769613.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e1b246662c0da61fb027e2ca9de0e900/61765528574.pdfIn PDF document text
    • http://acril.ru/ufiles/files/zaxutamo.pdfIn PDF document text
    • https://stauber.lt/images/files/20771910207.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/jamuzuserumowuxof.pdfIn PDF document text
    • https://ivanamihic.com/files/22465352741.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109131700167925.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/pigabusorudekuramami.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/87313656514.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/60030544517.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i588n1bmtpvi07nuav15kdjcue/16173123054.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c001ce7217f72bca191ee32797790500/zefuzuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dragon+ball+tenkaichi+3+apk+downloadPDF 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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 11116 bytes
SHA-256: 3b948f05a5eaca08c4266497957e15753ec302eda163cfa99857deb880ebde6d
font_02_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 15132 bytes
SHA-256: 13c82a8df80f7e5a9e5bd761bcebd02e62879105607459357253409aae894475

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