Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bc6d1d5f7e02db…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 17:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 4263d595ee257ff9fa1b0c7005181836 SHA-1: e738c102a9a86bcfa997625e6b9a369f6035a3cf SHA-256: 65bc6d1d5f7e02dbe94c6d394412475e4b90e289f78e04abf6687de90b5e1ead
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://beautifulhairstore.com/upload/files/sefixedi.pdf In PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/43582404491.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/71617682379.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/busotikevevaraxaxi.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/sugipelin.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9s9o0vadj746smes8p0b7d6u67/8937816755.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wazevotifozuverolevo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7d62bd1b7957c28d5d4e024cc5109691/51496037453.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/3378067666.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vruq4hsnin9ndecslcr8mfc298/87642314824.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/64126823624.pdfIn PDF document text
    • http://vucert.vn/uploads/files/jujutowusotokunofubogegi.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/pevewamivatigigepenobu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/mefopovutekoxararu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109081722319630.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/zebokoburobaxo.pdfIn macro / runtime command snippet
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134278a38f93---vejerame.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/95465700384.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/gudofozotizejosoxedijerov.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/23334155279.pdfIn PDF document text
    • https://cubic.is/userfiles/file/51864783524.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/65876676430.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/foxerivakobenaruxenutuvam.pdfIn PDF document text
    • http://hanifeugur.com/image/files/sakupemajezakijesifoxa.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/bebiridoviwit.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/35715831383.pdfIn PDF document text
    • http://sitoad.coIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=redmi+note+10+vs+note+10s+vs+note+10+proPDF 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_off0000b8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D1 17708 bytes
SHA-256: 7210b9a72ba904a7e8833c0f37d6251025a7022eff7e32aabf966bc4aa4c3559
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 10632 bytes
SHA-256: 7ecea389ebc9b8df67f84ec60cf40a63a197e008f327ff60d3a9287f13c647af
font_02_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1