Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f88b09363eb690…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 00:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 050965d35d756bc71683752f775b6d9c SHA-1: 2ce6150aa6a43c2b1aa01b43b92f43d6f9f31099 SHA-256: c0f88b09363eb6901febb5aafddd54f91355abf1c272aa916d80809a558fc3a9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and a lure instructing the user to copy/paste content into a command-line interface, indicating a likely attempt to trick the user into executing malicious commands. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160968c97e8431---nokedigufipediwase.pdf In PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/kuvavaxafagipe.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a89d0289a46fe4f6ef63afbcfeea58d1/duretuw.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18675538522.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kimaginesevoniketab.pdfIn PDF document text
    • https://dm288.rs/slicice/file/12226391526.pdfIn PDF document text
    • http://sns.hu/_user/file/zomisawagevawukapajipog.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af4af1602---kijovajoxelikizuxu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/mutazuninepedidoxamabe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda69fe9035---15588904110.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/6365233747.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b80bae360af---66463467217.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/supotemusudib.pdfIn PDF document text
    • http://allycatering.com/userfiles/waniv.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607768d9eb37d---25458321510.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d3cb6aaf---79983039657.pdfIn PDF document text
    • http://mextro.de/upload/files/63332467936.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/3sbqcb9iajg07q4d3eb1bftj37/fatofonigonefujefogu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210513211459741960129.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/33e3165b016fc7a50fbca30f5f34013d/88178399617.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/butopuza.pdfIn PDF document text
    • http://askort.pl/Upload/file/97426764379.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767eacb0029---13415979662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=boot+linux+on+chromebookPDF 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_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 17128 bytes
SHA-256: ae68f8aca3b9ecc9e63f5c5af3d2fdbd42815a8350fa30697f87296d16faef16
font_02_sfnt_off000142cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CD 10652 bytes
SHA-256: 5fd072cbd3691bb0e18faec65b56af5e04623fce3aec49a372def56901adda87

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