Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ebf4a5d869026b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 14:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c26c7d66e6ce9d08880ff9ad571de683 SHA-1: 3754a0e10af213b9b1c3cae32ee7f205f3b105e9 SHA-256: 86ebf4a5d869026bce91f23f6980eb25208721bdbbdd51817c8103b6101c7edd
196 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS uploads. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic for malware delivery or credential harvesting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

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://philabc.ru/uplcv?utm_term=good+adblock+for+android PDF link annotation
    • http://neurooperations.com/ckfinder/userfiles/files/bazometedixuwanebos.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nutevevuwusepeze.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100318316805.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/36175157755.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/xiruw.pdfIn PDF document text
    • https://raljob.com/userfiles/file/84182304955.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/wevufazege.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lolejuzunafulilopujumujam.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/181b802627270bf3a7f83cbb1affc575/rotuvur.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/jogexiramujedabelelu.pdfIn PDF document text
    • http://kahasat.cz/data/file/gojolavafiwezazilotadako.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/lajomuvosijig.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/11457749415.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210901193407.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/vodebabepujusewogiler.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fenibimo.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/majalow.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/ranik.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/9387341652.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9e597cfd6bf1fd5da5d12552ff098976/zogunevasejepopavusaw.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc4098eb2---fajosinarazajabo.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ketefozapexegof.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/61390591353.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/bagaramagapodavonurugu.pdfIn PDF document text
    • http://sial.pl/galeria/file/zaxameguganuxobuxaviwefox.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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 18484 bytes
SHA-256: 1ea0e37d3b33974bfac856be75981303b6a4199188216e4277cd001f6b8b0ae2
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10344 bytes
SHA-256: a8be709d9f1836a3b075b261a6714c8c2004c87822ae5d38f18e12e6ed90f597
font_02_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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