Malicious PDF — malware analysis report

Static analysis result for SHA-256 3103ac3ef2e940d6…

MALICIOUS

PDF

92.6 KB Created: 2021-08-20 04:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6db96e24661fe882729cc647c9ec4ccf SHA-1: ec19813aa4f05f8f3e8c66f7e5d47c0de2777b26 SHA-256: 3103ac3ef2e940d6dda7c5cda1b4ac2d35a7711833f9e35e1bf368c3fb89d982
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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://mamotato.ro/userfiles/file/jolisazefodupebejekol.pdf In PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/gomukaxuvesipatuwowizepen.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c640f991ca0---ranum.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/ranerekofubijezubu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/588611786.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/texogixiziguzo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/st5pdlv582053o0bia3pd1gqo5/83833808473.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab094689bf---tavuxivexeve.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/57178917639.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09aee17dbce856c008847417af838d82/93753350140.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/14208353984.pdfIn PDF document text
    • http://ned.ru/uploads/files/kililujosilamalaguguv.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996ea1deb83---72540467379.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/19566441227.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/62788335543.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/56496083234.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/38464642635.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/80d46e8cdc014a0006412eb0435344a5/71618318097.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f226541a---7009218744.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/51470139618.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/tanuvl981g3qi1f75btuckfh8n/zivewoj.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/68039839310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=household+budget+excel+spreadsheet+freePDF 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_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 11036 bytes
SHA-256: 0d63323b33eed71fa9d1ccea9ae5894ef6e8ed5949c2aa3172d45b3646a9b7ae
font_01_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 16984 bytes
SHA-256: 623da5e1e9143b3ffeff315a87bb6116509844eefaf911aa4703ce3edb17aac1

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