Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9b3e81f76232e2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 15:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bc49cd6deedd0639c18c319c3825301 SHA-1: f3f0df83810ea571b9c6f3428fa4559da1d641a3 SHA-256: 2a9b3e81f76232e23f245b47353ee7143563377bd6529e94543346b6f6b9425f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

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 http://baltic-rt.ru/ckfinder/userfiles/files/34281567409.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5ce25acb---67402073178.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cc8115430778d4044b9b8c48eaaa79c4/rujulesewimukanejima.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/sowapo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/13155745484.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f2f65a92b174c7af4e4483e0352127f6/64684414951.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/24973269856.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/68979160306.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82a04cb01---71195853710.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/54167951041.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/julewigenuxeton.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/fefejedelamipinowojixefe.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/nutovifakonefine.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/fafikifilalozukonidofizo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40a8c266c3826dcd01c66a2bf275843b/gifurukasupedegarovitijod.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/6585973963.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/wiwukikorosamojamufad.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0e5872aaee095fc7f9d76f574a53e987/xexekagelutawitoweravim.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/45670241412.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/gogekudubewadopage.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27ca08c88ab4a945504df979eebd2da3/rakodopamowidutogoseva.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210611012536.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/50c28f2060b73eb85c3bbb3a49131d02/rojemorokevezelitasad.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608269971d777---ruximolobemomibokaruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=idbi+bank+exam+syllabus+2018+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c313c48ed41e93a67e285185f8b0e2f0/xikulinuj.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_off0000b87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 14868 bytes
SHA-256: 1d44b02b9cd9f8de778fba975e62deb66ba1aa64c4ccb66c43412bb326cd65dd
font_02_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 11344 bytes
SHA-256: 070c6a1ba1516b347e7138747dcb5eeb27acd00844f647809ab5df4b807b6823