Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cad2853ec6ddf77…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 15:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f12693524f5151508ccaf8d2065fcd6 SHA-1: 380136d480561509bade17ea9ccc69e0c354de63 SHA-256: 7cad2853ec6ddf77afbfd19d849b4f56ade115fd055ac8d1f341c3b9b7593e3c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The presence of PDF_JS and PDF_URI heuristics confirms the execution of JavaScript and the use of external links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://servicedental.it/userfiles/files/43869385963.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2ce8ac9847c3879d31f491277130463d/17579154601.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/98567242149.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/tanofaduwama.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/42346374590.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72eb43a9b---surezefavotaderati.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/minurevopatixazokinux.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160956e5ccaac0---dujalatixonanu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6hbu9c0rgfb970cm6h7vhb1jrm/tovan.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/65392986637.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ea8ce27f2a83e8c9b44794eaa706ad5/gajoredivasunegijuvi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea20a861cd---rezosizozegi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ie25tgf4m3v1mbnsjc086nrrvq/77644933010.pdfIn PDF document text
    • http://vucert.vn/uploads/files/kozenanozikesoto.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9557e0ccf23045e55abc7e5db5136b62/posotomasateb.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8035fcbafc49ead13b9fe027974147ae/zivifamogeluzerox.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/26859394741.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/sawoluvawogowokogejuj.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/tabobawagofesajixov.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/91b3d358fc4ad149c2844dc56dc766ac/bozuvo.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/572ba692665ddd75b116f226bf003e1a/2559942244.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/36675064472.pdfIn PDF document text
    • https://promise-land.com/upload/file/leguvepoxanedasovubabuf.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gudaruniwunufi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/36234e7b2c5715c3b2eb3af947afe463/89983013996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=narnia+prince+caspian+pdf+free+downloadPDF link annotation
    • 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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 18688 bytes
SHA-256: 699971c636aef306d015b896578709879302c62baff12181182f75e81e03baa0
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10580 bytes
SHA-256: 686094457b1c232e172e2bcd9986307ad63e9fe72086427599e38b6d8a4dfb65

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