Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9d2a00f5c52b19…

MALICIOUS

PDF

73.9 KB Created: 2021-10-11 13:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d24c8cb227b8a3b49c89b108dadf92ec SHA-1: d5974d302ed52c8097f94a7367379dc0d569ed21 SHA-256: 4d9d2a00f5c52b19bc505cd418ac9f764c53527238be477a98939544a84ab240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites, which are likely used to distribute further malicious content or conduct phishing attacks. The presence of numerous links on disposable or compromised hosting indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8955b15c2---77225724189.pdf In PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/17520959168.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/3878427363.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9db1a938dd11c22b9d970df05fcc7daf/mexetidimepur.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/28290618644.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6115251a---rumipefukufaru.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/84672582775.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/15797815109.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161620800d5d2e.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/nizelowutijemunap.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/78617390421.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/68671456250.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615dd6aee2b20---81457292257.pdfIn PDF document text
    • http://fnathservices.com/upload/file/kafuwaziserelexijujufem.pdfIn PDF document text
    • http://knauto.com/upload/file///20078794847.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615bc518b06b7---39080818805.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nijigujakelu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nalifevel.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/8dd3917a11aee1d2d7d792cf729f0efc/juvuzupagewolapux.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/44372911928.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459269a8ca5---63818360277.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=how+many+eggs+does+an+emu+lay+a+yearPDF 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_off0000be87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 10692 bytes
SHA-256: 9001df075bd84749a4fbc332d0616b4de9ec6c49403d3f9dbd722a9d03178f75
font_01_sfnt_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16820 bytes
SHA-256: c0bbde792c2d908cf0ceab9ec6a0d947ee4bc6ad1be065a3d29a3a49eb39423f
font_02_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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