Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b3f34b991ce2cb…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 18:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e63741c87487147b23946c3569f64447 SHA-1: 0763b24675e16fc289c26d23d909b48b75275eaa SHA-256: c1b3f34b991ce2cbf7364a7590baeab3692a4a7df978cd6e567fb55831d83482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=penguin+active+reading+pdf PDF link annotation
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/logarobapijanogero.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/25430199659.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/dikamebarufurepunexamuv.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/kazipafogakonimasosazaso.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021712047367740.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096b74216397---76009137552.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/nogux.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/63593420202.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/salegopusuzo.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/78025208389.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/65314adbcc8bb26f7d3b5ab26439ee10/belozavuzoju.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed9adf59b---8172882742.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee71401c22---vukufewizo.pdfIn PDF document text
    • http://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/41850030955.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c19c86ad---63585702872.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/guzugifetugegejetif.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/q860ogvi622b31g47v78fc0kg5/gikababobifov.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/da0ebe40529bd27dcea580d92f6d52c2/kivadofiwonirewabexurav.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608093a8b5e2d---1221613862.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xevibowezawazuzaruzik.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/g8hjmqqm6mq12fna2da86ke52j/lafebekuvew.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602002100.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5e3858e447226505b5c598981c384c1f/soret.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 17224 bytes
SHA-256: 352fb5829ea7e1a7930109e768c788b78a37d9daaef08d3ef1d838ee3f43381a
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 10628 bytes
SHA-256: d811b06ffa904e563514cfb60db6474024ed03efcdc9942e4c5d44d105747263

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