Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3cc3f7c3bfac65…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9f958f857cbcc9edad324d5b0015ee5 SHA-1: edea915817f6e760629d6be37de8626a16152ad7 SHA-256: fb3cc3f7c3bfac65cc55299cf37d49cd0e641dd70b9797a50e35227b92fbdf0d
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 compromised CMS uploads or disposable hosting, indicating a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=what+is+the+biggest+country PDF link annotation
    • http://www.ocptecnology.com/admin/uploaded/fck/file/jurasaxu.pdfIn PDF document text
    • https://tavio.ru/files/file/kukufowab.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/83830994777.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbf381ef0---88863710519.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/10604406679.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/32349235598.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/dudiledisobixojeve.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/14037043957.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/ledoziremixipituwaxej.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/gisikududinopikazaba.pdfIn PDF document text
    • https://hsse.cl/files/76825293190.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/84112759061.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353cd524502---wesudu.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/12030982385.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/xaroliwojav.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gafenejezeto.pdfIn PDF document text
    • https://ijpdua.com/contents/files/dudulawoxovobawulo.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/nikabizokem.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3a80f42291363a1c5568e77cfa7b20e6/9754376016.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/rowux.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a4ad5b11dc69e65a0a11d99c4e4eb6e1/rajirifemota.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/31341989993.pdfIn PDF document text
    • https://expomediainc.com/upload/file/gilevom.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/videsoseturalitip.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m481lf84dqb1qeogua22pdqc8i/14849753330.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/88801694112.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_off0000c15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15D 16756 bytes
SHA-256: 0d83f3bf7af43c3d5de49f61bb7968da0d95acc22435d1b62b2e7c7383f25934
font_01_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 10808 bytes
SHA-256: 36557d6a429d1f9b6cd161418cbb91ae9fa48aa0e8de5de015ccd3972108dd04
font_02_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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