Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae64ce33a0f5da0…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 08:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b48e7477e78fc864de5b5e7c37998e9 SHA-1: b654ce5806025163669335a6985e67d859e49735 SHA-256: 1ae64ce33a0f5da0db20df500ee0bb63d6f379aa33839b6694a8778c85450aeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript points towards an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=nairobi+university+application+form+pdf PDF link annotation
    • http://anandamsanyal.com/userfiles/file/67302182527.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/35725213476.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/53337271097.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f206cd8a00---fuzubasovi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d8ba22151a5a047f95db7d61503536d6/fajakojapifa.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/67185222723.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/kubana.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/64762083854.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/52225123047.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/fogavoxamaxubop.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/81308698701.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a253e6ae894---28926133892.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/toranatotukisuzazawakuwim.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/97905977180.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/laliriravev.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/pafebepenoju.pdfIn PDF document text
    • http://marketingnews.fr/images/file/5950671182.pdfIn PDF document text
    • http://belst.by/upload/file/49951744908.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/50bcf3c88472bf73f487e74d5ed0ba05/wojozobowefejinutalazusep.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/podaselogafazozatepur.pdfIn PDF document text
    • http://jiab.net/userData/board/file/82649080467.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/ginesovenedoxadibixi.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/zoxelarosidetovuxuk.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/73348700159.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba28b430392---zepeg.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/nulukojodufubozupone.pdfIn PDF document text
    • 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 11176 bytes
SHA-256: e3114a3cc50e02c21993f7e269568601ad2c2394923f8c8f43935ef2b9b7ee71
font_01_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 18768 bytes
SHA-256: c02be4be7f58cc3fb528cc48a65d4cf8ae769807dfe4794e5c355e4d89e06c1c
font_02_sfnt_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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