Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ee788d277396a9…

MALICIOUS

PDF

77.4 KB Created: 2021-10-12 08:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c734ef8c3500ce9f10e84fdccb4fbd48 SHA-1: b72e184478686f713ba820efa6ceb1aa65600deb SHA-256: 76ee788d277396a90fadfacead8b1fd3bb0d78dc60c8c0ee69d1c073f3868fe2
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. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=barbie+diamond+castle+two+voices+one+song PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614edd3d81705---75846287931.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/xogazokoxuv.pdfIn PDF document text
    • https://palet-school.com/files/files/49091284754.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/sowazakavajugimalo.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/58996453450.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/nupoto.pdfIn PDF document text
    • http://zerosquareonline.com/file/gipozezakojujojaxapo.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/damekuwize.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/nixowedagiwav.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/likenumeruwoloxemijufoxe.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/99792575281.pdfIn PDF document text
    • https://felicityokolo.com/file/lafamojubisasu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161487f00d59e9---16383980736.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/83910435132.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/7559305269.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/97857505990.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bopixiremodulupe.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a4adb3f5b82018edcea398f8902828f/22148572111.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1643c5ad---99289206914.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/vowesudowujekug.pdfIn PDF document text
    • https://domilot.com/uploader/files/wifajeromadunegiro.pdfIn PDF document text
    • https://melz-feu.ru/upload/wemoxeperam.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/90914703289.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_off0000c3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B7 19548 bytes
SHA-256: 0d13d03f6b6ab32d672e46d55632de6a19f8c56e35ec8e77304e99af3d08029c
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 11056 bytes
SHA-256: 723dbf4413da1ac355b0eb92f30495e6a1c0c9ead677f26ff4fd4d8f16ddaddd

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