Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8511d55a4e065a5…

MALICIOUS

PDF

92.4 KB Created: 2021-08-16 00:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3850fea5cf9593ab253403f334f79bcc SHA-1: 8d1b9016f7d573dfba24abd182989001c7a7353b SHA-256: f8511d55a4e065a5771d94ce4222d429a6d88f1536168c4ba2ee64c453fb6051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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://inwebjor.ru/uplcv?utm_term=como+cocinar+la+carne+de+puerco+para+tamales PDF link annotation
    • http://bellsazshihtzu.com/clients/878694/File/99781039288.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/gozetesozutulokova.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/80160553012.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qnvn39v83o7hb3j4jj7impngtr/jisurogalekonijuxipevep.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/56121090667.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/t6lt5jv72ubkp0qr06nkreln06/wozuniwolize.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/97ccfa29f77f24354ac925d2b400b2d0/fepagafawemezosu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/pukojowekusipozugap.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/627f690ee1838700c8b5ae721c28d255/26645949118.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/6635345780.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/sesenozifor.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/76306520015.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/93836588938.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/bukatadilazodowofosu.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/ribujepop.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609812ba62785---23785359052.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/kopomem.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/48258219077.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/35588b32ce9c25cc5aadf4d3b14bcfda/rafusobobe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/if3kmt0l7nkm50j430qqfbigdn/wubazijapijavaxomemapix.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/um1gmbmr7ujs3vbbo54vi1fus3/74431804627.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3c53092931b843c0fa3738db402d36c8/pirupumuratikututufujiwik.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gebutuvunododit.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c2d2ebd83be773131e92d1e6e76f8d16/25842547506.pdfIn PDF document text
    • https://termocasasrl.com/file/mixudixediwozetajoravokam.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a74be336f---nudonetipovatumakudiset.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fajen.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10804 bytes
SHA-256: c5e271f62dba760bec6e085a152b41ffdbc8471c23e19ab64210269aa23c28a8
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 18396 bytes
SHA-256: 7a62f53d9cf4490e6d86415d49d160745f4192b5776eb19d62493ddc98345be6
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 17364 bytes
SHA-256: b452595e1e3db3b1e3d0fe916b5f6a0483dd2ad9e0f407c26b0f2540fe033d08
font_03_sfnt_off00014006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14006 1824 bytes
SHA-256: 065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8
font_04_sfnt_off00014897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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