Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d4bde7660faa58…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c58c15176a131f04e5a95d3e6f5e276f SHA-1: 2b99a72acfb32531381c1b31dc3180a0913425f3 SHA-256: f6d4bde7660faa58e5d358e62e23ae06c21f9c6b86568e41c94165bffdeb9cf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to host phishing content or distribute further malware. The embedded JavaScript is likely responsible for initiating the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://zhodnoceni-penez.cz/is/images/FCKeditor/File/foxiduxo.pdf In PDF document text
    • https://aydin-elektrik.com/resimler/files/dazufugobapeguxeto.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/90925454397.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/17194750440.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/gegiwedugokuwi.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/56984979377.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136185cb902d---tesawazevavipixi.pdfIn PDF document text
    • http://meskerjager.nl/media/files/80210963910.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1cde92d8ff2ef3cb6eebcb9cdd56d23d/filarufozapavojuw.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxonisazegalegujoritidex.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/26685695356.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f14ae0a6---37759990372.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jisezoxikunebok.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/vovamidinudufedadivafuje.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/jaxakupubiwazitataraw.pdfIn PDF document text
    • http://baove247.org/upload/files/9439466238.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/susasuwelewegim.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/jageke.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/mefegoruka.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e6f7e28d09c55f4951b42aa8f1c6b66d/91467898649.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/medefelulaloripew.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1d8e1e5c---20143957314.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tugogavokekitudo.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/63782504884.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mafedipupuwotexujolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=animated+porn+game+androidPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 17436 bytes
SHA-256: 0003f8bc2e4a57c2aa9442660a9fe20a9daa4873e339e7a11fbb9f02b8cea707
font_01_sfnt_off00011175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001298c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298C 10504 bytes
SHA-256: 151a0803d6183e453cc934657fd47de8c5066d0ba2cf34a7261e91d03ae2edff

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