Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f1c27de75abe91…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 05:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0342873a1d18c6f882a306b766751f2 SHA-1: 448d5359d9330a1103d2aaab57679e76dc7b583f SHA-256: 49f1c27de75abe91b79b250b3a136e7549a8c83f3e4983f1741d638963f6d441
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, many of which point to link farms on disposable hosting or compromised CMS uploads. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick the user into installing malicious software. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=windows+8.1+single+language+activation+key+64+bit PDF link annotation
    • http://romengo.com/ckfinder/userfiles/files/jolizubusoluvoforu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353f4e2d0d7---64840570631.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2d135ad---vujamudanik.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904213142.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/xanomonimadokexedew.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40730311531.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4676c9b36---nubizigaluw.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/57632418684.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/pokironefanezo.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/waniradosobasumegebubi.pdfIn PDF document text
    • http://selidbe-beograd.info/files/52721947824.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/lasuwawaniselapejamudip.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed58ce320---nakufubukenav.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/dopewovexumevokekukej.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/pasoseledededida.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/nedefatuxenexalufidazi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbc8cd18a---78512957250.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/39381572668.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/20054954146.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/73023471745.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/dofowoteritavamexobobipi.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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 17724 bytes
SHA-256: 5b5a8d82ee1c25b9cef41870d57dc40c35b7a9bad86465d921b868178b78b53e
font_01_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 11608 bytes
SHA-256: 790878391ce360379674f6fb8fbf7018cc1d6a9b8fec190e9b504c06868d5ac4
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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