Malicious PDF — malware analysis report

Static analysis result for SHA-256 9580016daca92a71…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 17:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f2ea4f29a391dc465813fae2326a6b8 SHA-1: cd13531b7d8d72e2acd8dc6d77126c9553db459f SHA-256: 9580016daca92a717d594a8530c3fc4204507e8e7a201313bd427163616e4549
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, many of which host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using disposable or compromised hosting for malicious content distribution. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://timnhanhonline.net/upload/files/dovoribage.pdf In PDF document text
    • http://aytekinpolatel.com/image/files/40673170788.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vonepudififamowabopul.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/24746446053.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8236426fdfb6842dfd9a075566112dc1/nujumofofafobuxigu.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/mumekujejezamopasizus.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/najiximuxewelami.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/76064095037.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/ruxosamunazofusawowotazoz.pdfIn PDF document text
    • http://oilspecchem.com/files/ludaj.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/96865919887.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/kutoxaxu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bchka71nshbdbel83u75m65hcv/fosejubixiloribikuz.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/vusivawos.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sibedofexerib.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4dd74daa---71444921638.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/ruvezoxetivow.pdfIn PDF document text
    • https://resicolor.com/upload/files/6240202291.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/15364276518.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/xibapalagevujo.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/63914316922.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161458a74267f7---nelokakejixarititin.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/15406ae2b5ca1805de0eb0cdad3241d3/jitejaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+debugging+toolPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398be907699---vozijexifupivi.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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16136 bytes
SHA-256: 4b452d13e0d33e108b7b36fc7f08a9cf011e7ffbd778ccd71ddacfa9ccc4cca4
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 10316 bytes
SHA-256: 0480399ddfe8d5c805963f7df5c3effaf73e5297a97575248d193b363d156331
font_02_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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