Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94f5f509db13b93…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 00:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3ccf7501e7ff70c45b66ab8814a5ea5 SHA-1: 4075f44d66df9e3e74892e35cbaf604d66e38cdc SHA-256: d94f5f509db13b930b04d4109852cb15a72a4accbde1533843477f0aa55cde96
244 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan. Heuristics indicate it contains embedded JavaScript and presents lures for installing browser extensions or remote support tools. The document body is heavily obfuscated, but the presence of JavaScript and the social engineering lures suggest it is designed to download and execute a second-stage payload or facilitate unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://uudanbury.life/files/file/29871950305.pdf In PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28858512064.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/23467282754.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631959870.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c337b01ab9---55635521170.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/57424345955.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xojanaru.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/muzuteses.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/45941391863.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/44039089803.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16315223161602450409.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1db02fabb33edfc142ff45f4df9f7ec9/gobaw.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913173340769.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139721cbe359---pimonironozadikezapefof.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/levepirenefekotup.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b909779b54b4cc305a8feb988b24d361/masadediwojudu.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/30474058306.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/kijesopuwepiwelarinokot.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/57870700514.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f356f71f5f---daralir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fnaf+help+wanted+free+download+mobilePDF link annotation
    • 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 17392 bytes
SHA-256: cf508d5a6375c7b5ff265ecc1cffb1fcfcefbec32762319d23263556a465bd6e
font_01_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 10800 bytes
SHA-256: ff43a404990f3b381720860b623ce53acd85a3b6b887297e51a824f2c82706f6
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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