Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a11c6497cdb0a12…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 21:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75004dd6c9ce1a01fb8d762a9bedcc22 SHA-1: a7974c6bc22defc54f6bad2bac609071197ed3b5 SHA-256: 1a11c6497cdb0a128bbe8ca5332c78acef7c6b65c66ad19db90a6b9af0e02adb
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update. The presence of numerous external links, many pointing to compromised WordPress sites and disposable hosting, further supports this. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via the described social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://laborke.ru/uplcv?utm_term=how+can+i+block+a+website+on+chrome PDF link annotation
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/zabuzez.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd0d590b4---kazegalijazipekoxoxavor.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161323d9db0593---72412143119.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/penunifumawezit.pdfIn PDF document text
    • http://creationart.hu/files/file/maduzugasojujasodamaravov.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/68450038369.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/repufi.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/kajikefufapor.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/94486550139.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267012831b---4450949230.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/60356288903.pdfIn PDF document text
    • http://hla.vn/upload/files/69068108227.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/dufokuvug.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcu7b274aqtiuec643ur7ge6n9/bisumalodiritowilozorup.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/gowelisalositipomunan.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/kiloxizililigogefove.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/vivageg.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/xuwunuzixikiwu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jobixixirataxigutopafojez.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/700ff236b6b101d0d65eb812262b8606/famiveduwenuredi.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631539216.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/40512561504.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf7e04c89---zasibajinisebolumuvu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/pewitozox.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 17756 bytes
SHA-256: 8fb83aa92fcb1c177c25b363d288330e0e74ccdec52b86b09d9016b975d9ffea
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 10804 bytes
SHA-256: b2b23c52a234cfa72b4a8b26437f6e1c0b3448cbc9c9d60b12cb018732b84d02

Open this report in the interactive analyzer, or submit your own file for analysis.