Malicious PDF — malware analysis report

Static analysis result for SHA-256 952613deeea826c6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 15:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ddbda2b74e8549bc918c92aee98fb58 SHA-1: 4f8243687b45e5750ded95da3d349358f20eb063 SHA-256: 952613deeea826c60daf8a3e4a6a1c82c97b91773bc9cded54a638fcf701c122
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tuttotop.com/userfiles/files/38013706453.pdf In PDF document text
    • http://netinflux.net/userfiles/file/86096378999.pdfIn PDF document text
    • http://stromzeleny.cz/file/30574112971.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/65757781407.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/54645418790.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/70120034302.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/56200424273.pdfIn PDF document text
    • http://congtyvima.com/images/Download/majovoxuxevujuva.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/tapujiponorimaxamejexe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f63277687---8913080565.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143667465bf4---bajakederezifipoxuluxas.pdfIn PDF document text
    • http://www.ezmoving.com/file/zetuwukujelisirexakaxited.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/bupufozunuviriponiv.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/nesimixer.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/42090472016.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/55476203838.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/nikiguj.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/81564695871.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/kalef.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ee88d3287606f468160f3047cac10b07/wazoferuxunekexumodigawa.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161487f66764ff---bariziledubupe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/31358992880.pdfIn PDF document text
    • http://bwc.lt/i/49596454384.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/loj6pqu4mq848lahm3aaosliq2/vumifazos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tubemate+222+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_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 17212 bytes
SHA-256: d6d81b3d0c69ad90b39497ac598e43496d58b4579f82c65c6ca93c1a275079ed
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 10664 bytes
SHA-256: a865f1d10e86e07a2685ea7bb68d6d2877811baab911a13fab61a1cf76c00716

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