Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8080506fd9a5ea9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 09:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a689dec6409d459e460f56e0b05866c SHA-1: 729ea369adda1ed32ae56c4e4a318d6a571c68a7 SHA-256: c8080506fd9a5ea91469b3c1690b4ced3fe79a98b296e8b3b48e070263ccbb94
196 Risk Score

Malware Insights

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

The file is a PDF that employs a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it likely leads to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://pistant.ru/uplcv?utm_term=who+looks+at+my+instagram PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142b91233f67---gewete.pdfIn PDF document text
    • http://robedecreateur.com/img/files/71798116344.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/noniwupugomigumuron.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/fabumagesa.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210913021259.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458149369a9---zisafodamafi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gimefividotukisovidima.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/99485432255.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/5689798171.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/godasizomid.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/jamokadolelubewaju.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/211444435.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/xejufedaxewijefe.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/razovunutikirabuxonisi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130aaf5ccbd1---lexebaxawuwawazodin.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xojunubamojenuveru.pdfIn PDF document text
    • http://3q1p.com/upload/file/210918111719294627bag6v8swh651.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fefasivinotoli.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/nexitukavitexasaduko.pdfIn PDF document text
    • http://gestioniarmatoriali.it/gesogavamon.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/47640534509.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/125257ee4df3cc8f4c2b31f6dd2d6362/51627525344.pdfIn PDF document text
    • http://ned.ru/uploads/files/72604289274.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nifasojeburu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc71234a2---91908363738.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/jogedewimoxixemufuwimevuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 10624 bytes
SHA-256: 1b1e8b6500ad06c1a90bc360524ff1aca66e375dbbb109edca81d1987dccae29
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 17452 bytes
SHA-256: fddda74d5c2d676ec2ad5b163ad5d08e18cce20391ac295a3a6d1fd1583fd915

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