Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f809e0e1f88f7cf…

MALICIOUS

PDF

115.2 KB Created: 2021-07-20 18:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d4fb6ee77b75ebc6eb3ffdc4883fb301 SHA-1: 14042f87de3aa79057cecdf38fc8c3252f533952 SHA-256: 4f809e0e1f88f7cf8455a9fa84cb3203116018222da863bfbd5028a9179e86e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate 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 0.9639

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://leganordavigliana.it/uploads/file/60054894719.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1204bd75---82296191163.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/2b5083a345625b011f5213245a63605d/didizisurelederolegafe.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/816150e70001b8eeb7abb6888b4dae0a/75570902203.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/49426165997.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/54130719327.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/nemiramagagol.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd999b47cb---maxesavitum.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/3629934098.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b55237d5e---45621711584.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/16807083155.pdfIn PDF document text
    • http://temple.mo/userfiles/file/bagunusiba.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607816667c6a9---fubarapisedi.pdfIn PDF document text
    • https://schmitz.cz/res/file/mawibuwa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790414ebd96---zawagixapetuvasenubumozim.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/31903560129.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6soalbf12jn1es7clodm3rgpou/legun.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/84175224286.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/94a5f2540c08aaa63e6b25d1e9aac50c/namefux.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/nemav.pdfIn PDF document text
    • http://ahchala.com/img/file/wowalekawe.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/kenejivujako.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772ade2a28e---58938938409.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/batuwijulatewur.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094cae104db6---3992987194.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7d9ad626---simosasutepu.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/50159444455.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fa9cd756b97a18fa7ca5ce6bbce43d1f/puboxodudekur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=anoint+your+head+with+oil+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E66 16632 bytes
SHA-256: ff68716322524b672498e7e1aa97fe0a5ec11b2b637ef013097ef36ee39f4243
font_01_sfnt_off000155dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DD 21380 bytes
SHA-256: 777cfa6a17c575653514c55462d53520eef4d0f1abaae4cc15302b54ac35c458
font_02_sfnt_off00018c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C5C 10808 bytes
SHA-256: 27392453717c8de26a27355398f2c6aad97d3fa28891de4f85918a92cea0ea53
font_03_sfnt_off0001a4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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