Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f9f73e899636f4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 19:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fff441e3c5f49366d5ada2d32d1b338f SHA-1: 2326126e5298949845d77684379538e104cdc6b3 SHA-256: f1f9f73e899636f4ba207ae49f65e9738812eeb5b4f95030ab6190feacbb2192
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely attempts to trick the user into installing a fake browser extension or update. The embedded URLs and link farm heuristics further suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://cructi.ru/uplcv?utm_term=how+to+take+data+from+broken+screen+phone PDF link annotation
    • http://meyergarden.com/ckfinder/userfiles/files/3585584224.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/bixegufi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614285c36f5da---70586143477.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/vujopoxesobezodela.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/80b45e9c570ec14a4081a846167a544e/78640393223.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/92211197768.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/74480987639.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/sirobuxijisinexega.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/76573764539.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210916_71CB95DF0F705E37.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/mugetoxoraf.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fa168b1---10304241.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/tadowuwemewujaminukuter.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161340ed52c676---13111093029.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/43740121066.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/42809803871.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/19234301369.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f193a13f0---kexoxisarinapelido.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tadepipi.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/nererozotenuruxevijilop.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/43259170777.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 17304 bytes
SHA-256: 17d9b63e2fa1101932eece88e368a4d89cec4ec51f3fa4c8c0476d136a4b914e
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 11056 bytes
SHA-256: e25e242484dbddc34374de25184534e67473147730d7b6852aa48d67c56018ae

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