Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf53de5f4023a3e5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 19:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba1989e80b62fb215ad75101a2d8ef12 SHA-1: 0c1b7ce09984cae470c875789053c10b7535cb0a SHA-256: cf53de5f4023a3e51bfea1a4624e924c5c48b83150d1fa56be1eb5265d0dede0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=best+pool+game+for+android+2020 PDF link annotation
    • http://tcsklife.com/filespath/files/20210912155321.pdfIn PDF document text
    • http://palami.by/images/file/ruwepojove.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202195946399409.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/wuxadobudaveze.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021910418501859.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161359d8d46570---72893291306.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/64073145459.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/17967245396.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1a1c2dfd---pizap.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/75542883455.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/fefopinagakusa.pdfIn PDF document text
    • https://securitydm.net/slicice/file/lebobufig.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gixaw.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/43170353640.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gezimamulogebixiruvukagi.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/67286055814.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/49794262fec6b015cbeb937f23daa861/93780571998.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/roxerusikokezum.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/40904053463.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/lizaxozapozi.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/1941005116.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/28492300277.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/88595844515.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909224753.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16532 bytes
SHA-256: b3ee014feee69872db7802e983f814a767668abbf1642433a3a2d100c5bae101
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 11136 bytes
SHA-256: 399c760a32deec0bdf62873b188b2e9a615194c87330720b68e1484018aab912
font_02_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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