Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af5b40d1c97a5fe…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 07:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ee2f606e81e1257fd638acbe0cd0038 SHA-1: 1b9f47b7f5eb5d9e8470341e3b8e64d4329d4003 SHA-256: 5af5b40d1c97a5fe8943b963daa2eedd17d1dc3dc8d11802bf24cac069109248
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://turar-mussin.com/userfiles/File/62884745711.pdf In PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/tobeven.pdfIn PDF document text
    • https://sharenkon.com/files/14444032546.pdfIn PDF document text
    • http://electroagro.es/pub/files/tumisafenobujep.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d22f030833---91808670687.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131765b7c9db---bevikebixikimijiwek.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/mukakepow.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/65419500222.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109080022097115.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/todeduvakikun.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f3c70daf---bofemobotufifazivepidovi.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/43329332068.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871d57d2e---10991488434.pdfIn PDF document text
    • http://caramelitos.sk/files/lonizitaraxe.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/30920937057.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6fb28c1b---lenagisujubalakisaz.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/21977593408.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/64811236185.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/fafebenedifotituvufe.pdfIn PDF document text
    • https://matricula.arendic.cl/files/78440023731.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/tarikuridoburapunorum.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/77576283260.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/malexa.pdfIn PDF document text
    • http://juncheng.tw/upload/files/tutop.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/wixelolepaxil.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/61590904384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apk+dead+triggerPDF 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 19520 bytes
SHA-256: 7ed57c13ccd0d8c72a79c1e7c8c04c670916f157c8a0d83c1446e062cef2a217
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 10204 bytes
SHA-256: 39d3a11b15639ce35309695e7a34a9145e9104d654d1a91f465344a9152a7557
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1