Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5adf3641c9e3f72…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 04:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 983025a51ad0a3c95055fe5c27fce40e SHA-1: e67bc47348ab9433eeba1e0a5e496c57c3934f5f SHA-256: e5adf3641c9e3f727362ad6086d8d9e462646b887e1a954688556ade88e38f1d
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering technique. The presence of numerous external URLs, some pointing to compromised WordPress uploads, further supports a malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://wastran.ru/uplcv?utm_term=uninstall+updates+android PDF link annotation
    • https://dd-inside.de/userfile/file/65140971261.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/roviranesujeripibarus.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/15992666083.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/29624488687.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/povewijiwojoxitiju.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad9070733---feroxujibet.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/defewotaxijapojorerifaxu.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210909071939.pdfIn PDF document text
    • http://ge-mak.com/files/jenipotunonikadunuposat.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/lusekeduxunotezum.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b8f84871---67429072411.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902133109.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pusofixerotoxowigoniwedid.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/vokujijaridaramon.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/rujevovadezojaluwuvelu.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/27623075404.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/75682497735.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/94040877622.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/04c39f3a61db9e41c790a2706209963e/jobatopotizi.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/1283909030.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/budumamatawapos.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/zazetefixodemi.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/95877630390.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xenojeka.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/nodekugelugepexa.pdfIn PDF document text
    • http://195exim.com/datas/files/jogefobesamepif.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/41492661483.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_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 17636 bytes
SHA-256: 029e5f03ffe0b05d3522debe26c9fddd05ad5cae48f1b650d5f1a3b48070f122
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 10492 bytes
SHA-256: c9478d23a9d117e57464fc9c71e5f761b9f750364050a62a5bbfb5c8f5eeb6d9

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