Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3f7123ac43e6ea…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 02:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c6f175364c97b7129502af7330319d4 SHA-1: 374e72cf687e0f29b6d3361a028960a9e701a286 SHA-256: 3c3f7123ac43e6ea7722addb736f5b5105f65e4afc899138325401644734c21f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=sviluppare+giochi+per+android PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jc3vm9nscb7aqj6ol8bsdds4h9/mepiwevosikorugibezu.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/mosixenesifijov.pdfIn PDF document text
    • http://baoveantam.info/upload/files/75593350499.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a9bf204a---53910309597.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb792c667---gemevegawulojipimesiniwux.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kawesumodozamope.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/naxikozelozagop.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/5745412358.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/18511697235.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/30547730879.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/defixiwufetalorulujak.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/rimupebodusilufizu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/mutotowisijatesoz.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/gelugirotexuzanozovokunu.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/wobopu.pdfIn PDF document text
    • https://soechi.com/userfiles/file/80515128641.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/43168380424.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/33007597834.pdfIn PDF document text
    • https://salonrewards.ca/images/file/85439745515.pdfIn PDF document text
    • http://agro-partner.com/Image/files/1344309373.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/senil.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161383178c8c6a---somubafafewigivisobif.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/69342500547.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/58609303718.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/90160332881.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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 17636 bytes
SHA-256: 20b41b79c3128c4130bf21ececd1b429440930f0520857b12e8145fd41ba94e3
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10768 bytes
SHA-256: 34e279e2870b119218e2a167ce98f3e08d15eb2bf6386225da443961cea6e8a8
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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