Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe8d31b0407b8fd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 18:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27d2fe50c1b2618d8f1d8481a17f8a5c SHA-1: d2e2602478164ff4dc00bfd087c67d22d2a0eae8 SHA-256: 9fe8d31b0407b8fd1542a29067c95d955bf34379837e560619700eadd096a05d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and link farms on disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser components. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://philabc.ru/uplcv?utm_term=download+chrome+update+for+android PDF link annotation
    • http://andrenickels.de/ckfinder/userfiles/files/depiwosa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e65190a2aa---mevazusodolagejolo.pdfIn PDF document text
    • https://digiconelectronics.com/media/nuwulefudalufexowuziseba.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/77305227319.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/42590189085.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/62439025591.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/diwik.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909232915.pdfIn PDF document text
    • https://anup.bo/images/files/85839119872.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407f404eff4---xefutidakaxekatedidanurid.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/dizasipusowewugusogi.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/87466379505.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/zaledenujivepo.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/10733823602.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/wisafimaso.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kfrgdlpuhfipaersod4usmqb7e/sutobeme.pdfIn PDF document text
    • http://matras-devison.com/upload/file/ruvukazasizavu.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xiwuvakizarejowovasipaj.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/86691012001.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/59719202012.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614213448b14d---3328917089.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/92216045348.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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 10904 bytes
SHA-256: 2081dda9bd036c799f86b9bb255346666b7bd608596ef4be4c88f5fb226f08a5
font_01_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16192 bytes
SHA-256: e75fd23a31ce9eb4c407e352ca5a8923a29e75462c39758c1e8a71acce764685

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