Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ed9f0b16056815…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 01:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35bf98ddee502ff25c68973d9deed087 SHA-1: a0faaee885a14130a7082a9e6ba9270bb11b164a SHA-256: b4ed9f0b160568158546e191d723b3fea64d60d9d770b8c1b6eaaa1d84786e30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://buyo-g.net/userfiles/file/6551408887.pdf In PDF document text
    • http://lohoithaiduong.com/uploads/files/dasevufotuborukowiledere.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377cd24a5ac---kitego.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/33287679837.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/tabesiwunofudimov.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/tapin.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/mitodanavinopeguz.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/nasozu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3518ba78eaba889b522a97ca2a410423/99541322571.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/74937090039.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146affbd511e---50154184546.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/99253266347.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/lixebed.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/17aa3923fbbcdfafe8ff2ac267c75caa/13280826621.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/voxus.pdfIn PDF document text
    • http://cudicio.it/images/file/juxakadolexekoliwulopuvin.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14d62637a---79809521340.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/vafekatavawitedogaviw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00fbef1f2---dokudelapojega.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414a294e6d1---wewexiwagisawidapenafufa.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/javufinepekalel.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/53438290842.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/sisutesufudotap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mrs+dalloway+pdfPDF 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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 17880 bytes
SHA-256: 5775c05885a0da18d8061cce8cfb6de27d62f4b4ffd336f947789ada1ee1c102
font_02_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 10256 bytes
SHA-256: 5ab53d35f105adfb6005d23348b64e05feedca7927445f2dad81f91043c52a9b

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