Malicious PDF — malware analysis report

Static analysis result for SHA-256 11955d23ac26e439…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 11:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4dada0e249136e5cc42bcb85cd047001 SHA-1: af505339024385d0cf443b805cc60f5f17ae7358 SHA-256: 11955d23ac26e43984a02a81c08693c43bb6e72cf7fd2bef874f558ae2a6ef31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting suggests the document is designed to redirect users to malicious sites or download further payloads. The primary attack pattern involves leveraging embedded scripts and external links to facilitate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=android+open+source+mail PDF link annotation
    • https://deitratech.com/userfiles/file/lepegubixe.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/sufuwob.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/ninenofijoradagomebuxu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63476392413.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614294824cb68---91263934751.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d77c85c5966e67ff2fb4b12e0e07ba29/xepilateritujegudigari.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/doperejuzelif.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145177f89b4f---togesunuvuwuj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca4b1975c---pugivor.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/97331023396.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/bepebexefev.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/6766641506.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/32543903687.pdfIn PDF document text
    • http://ridendo.cz/files/file/rajaxevomasijite.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/gosagekomajodob.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/rugape.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/sopidaseroni.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/falesaxewowiten.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1615160c5caa94---xoxir.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/47456673133.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16328116082515.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/mifabagositowifuvogudux.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/lewirutokerun.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/8914045683.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/jipizerup.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/30505005655.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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 10660 bytes
SHA-256: 158aa810daf3b7db40988af864f829701baed505b4923bb5db175c2ec033e246
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 17012 bytes
SHA-256: 4c939ebd7ae7d2c3292fa171363409d86a4710b533a1892842959f805ffb6dff
font_02_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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