Malicious PDF — malware analysis report

Static analysis result for SHA-256 486d15460dd9661d…

MALICIOUS

PDF

90.9 KB Created: 2021-09-04 21:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7c07303e3824425337c766f889b189cc SHA-1: b1157bc91a40c944baa1d79c1cd19e2647934936 SHA-256: 486d15460dd9661db4a3d8d4676be886547218728a9e4fcb4f0609cf064a3036
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ildungrice.com/fileupload/fckeditor/file/54846528702.pdf In PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/turujibugoke.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1cfe08775f1486ee40f8f13e5b8cda75/totuwesowupenepanoxakok.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/75577f8d5905bff20398c91ca92337e8/tisibomixoranakanok.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/98358091373.pdfIn PDF document text
    • http://poorclarescork.ie/images/90519965572.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15437519687.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/66229135180.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6186281317.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d658d48922---gumekutenaxafesadenidide.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ad6b4ee88c37dc69e8fc39c45b62f0eb/rimejujijuvibixoripim.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097af242a368---rewoxenezigewu.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/5179861279.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/43080106043.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/54515806684.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8426cb46a---91516275052.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160791b4726650---dupuxokojukiw.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/74596908373.pdfIn PDF document text
    • http://short-story.ru/upload/file/kamarobojokaxajini.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48e08074e---50258825431.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb18103880---fubijasejetid.pdfIn PDF document text
    • http://mega.kz/media/upload/files/numufizemo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5c0ff0ca4f135c54079402ad60b883a1/27247145801.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wakudaxakikebo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d50a72f465c7ea58d7e46cc3ec03be5f/91574514863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kalvisolai+10th+new+syllabus+book+pdfPDF 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_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11256 bytes
SHA-256: fc9c7b1ee242a21291cffc0db3fc6ed26c29bd073e1888e942ca9616f1d71d55
font_01_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 18344 bytes
SHA-256: 9e8c726109765a6958592135a8d7294c1659476e59032f7fdaa3c7584f80278f
font_02_sfnt_off0001450c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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