Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f39cadae445b3b8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 20:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 256ce6b7dd528fad82edf4307a52b279 SHA-1: bbfc2cfd1c46a70b359063f20dc5888c55784ab2 SHA-256: 4f39cadae445b3b83ecab14771b1254a8249610b83182db75d54a0d59fb7b323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and utilizing UTM parameters, indicative of a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=change+video+to+live+wallpaper
    • https://gornjastubica.hr/files/mivuwaxiroweledoletoruja.pdf
    • https://thegioibaobicarton.com/Images_upload/files/dukomafi.pdf
    • http://022-web.cn/uploadfile/file/20210918142943304.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebd965b9c---tifevisinakisamitar.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c53e62019---fuwiz.pdf
    • http://naoshima-tours.com/images/blog/file/koxuzuso.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/zuxefaketefar.pdf
    • http://innovatepc.com/userfiles/file/21382992809.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109100345594915.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/5530440475.pdf
    • https://cafepiolho.com/uploads/assets/tanowixiwamonex.pdf
    • https://cytairtool.com/test/userfiles/file/20210910_25f6d.pdf
    • http://jumpinfit.it/userfiles/files/napomokuwozo.pdf
    • https://fa-vietnam.com/webroot/img/files/gisunuvesawizotibi.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/83470047131.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qhubneg5p5evbon0ds497dijsj/79995619827.pdf
    • http://geose.ru/userfiles/file/98348259830.pdf
    • http://lightofislamonair.org/uploads/files/welatuvuwilalu.pdf
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/wizezonasivopizof.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce0594cb8ad597c8cc8ef9695d8717ef/70203349004.pdf
    • http://arcadia-fitness.es/userfiles/file/sowagobagopep.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3b49865f34e1de6b939ea4e975077a9f/31061384986.pdf
    • http://tunecharts.com/userfiles/file/norasoribilomaxefup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c215.bin
f27484e90927a6287bcb31bba98855955c243b0ffb24d85ce72005c530db0f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC215 10684 bytes
font_01_sfnt_off0000da59.bin
f4f1995c99a8f9321f84d174b73b9cb49fe8231905659ef73907165c8ad6c248		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16576 bytes
font_02_sfnt_off0001050b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 16792 bytes

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