Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43d7640d4db7c75…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 13:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e88bbb1ef17fb1476bfa7353e95fb5f SHA-1: 688f18901d3723c49a24af90f290206a5ec8c5f8 SHA-256: f43d7640d4db7c757a08215f4e9f4c496711ebe93f1473ec3e2533f13feeee50
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and contains a lure to execute commands via the clipboard. While no scripts were directly extracted, the presence of embedded URLs and the 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggest an attempt to trick the user into downloading and executing a secondary payload, likely leveraging a client-side exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://daithanhnam.com/upload/files/butoximaruwi.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7e7ca2c9---tikolotusadedis.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/79470405854.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/85029787243.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131838e50b25---jopepanawejotavobemiwom.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tokotetuwuze.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/86290644220.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/22512848961.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/28689433089.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314588f0924---5656447693.pdfIn PDF document text
    • http://one9five.com/userfiles/files/noduketesurejaze.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/95573089600.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/palowudanevu.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/mozexotel.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8f100ed36414cfacf322c0a56daf5e30/84811008263.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/34570728296.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37652706706.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/31224614669.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/juzesew.pdfIn PDF document text
    • https://aromamarketing.md/img/files/34607044778.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/notuzuwiretusosogawid.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/55321196334.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lifiro.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/kigukukegekal.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/niwado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=adb+download+pcPDF 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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 18884 bytes
SHA-256: f99333841c8cbcbbae85f61aa00f633c7310d0be7565366d561595fc473623f3
font_01_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 10124 bytes
SHA-256: 4ab31703809fe130ea7d419e054537bd6f8fe4b2675c6c9f690bebb415024885

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