Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd18341eaccb5a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 01:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4177a96b4a2b16837254e32357f43c3e SHA-1: 6dbaab338f14497ed1ba39c7e7fdae82f91eb770 SHA-256: b7cd18341eaccb5aef1b3842ce7ff804744d8f30ccfb94179bd039979482f292
244 Risk Score

Malware Insights

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

The PDF file exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. It employs social engineering tactics by presenting a fake download button and suggesting the user install a browser extension or update, a common lure for malware delivery. The document also contains numerous links to external sites, many hosted on potentially compromised or disposable domains, which likely serve as download sources for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=convertidor+online+de+archivos+pdf+a+jpg PDF link annotation
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/36437361620.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/takiferativunole.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xajexuzopover.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/55773057349.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/nofaxuxekinevefapatafekif.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/rolororiwimikiwasad.pdfIn PDF document text
    • http://getem.pl/files/file/bapavesudirelajatomapo.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/varuredujexu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb88c452---8537506044.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610ccf654d24a---mereforeletorarinolexima.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c227ebb1ff1---71319537045.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94e2afed8---62524578231.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/bf7ec777f411754e05657d598bd0a606/47615360243.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ac3ef78a73bdab32d747d3a2a780b56b/dopepunalavatejofilulav.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ipi5f0j4rnintnqle4ul8baeod/82304389510.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tezigimowomesobawa.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/3314157486.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/40840977391.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/warotawuderotasasedaju.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/16183373422.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a357049dd8---90025000050.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/56756323091.pdfIn PDF document text
    • https://ocw.tw/uploads/files/24208296424.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_off0000d148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD148 11128 bytes
SHA-256: 3da5aeceeb57a44590d9f6fa6c294a4234af98e4822172e4e3dbe924979b1268
font_01_sfnt_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 18100 bytes
SHA-256: 9b1e4a77fa0a36f2436e183e9685dd390e092f004cda99e7e2e13a4204ac3915

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