Malicious PDF — malware analysis report

Static analysis result for SHA-256 a318ac5669e74224…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 16:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e07821911644ad815fb7429764f888de SHA-1: 67266b9682054b5cf6038eab4c57a145fd5a42ca SHA-256: a318ac5669e74224ea1c53eca255d8118c6e8a015007c6de072a61f81bf69689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe556e2f7---jefimisalikisojogitimi.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/spn8p2u8nrh8bd0r3fmo0ami91/tenevodegogexuvifujejevoz.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/30834695405.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c76dc01ee---91962204087.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/ninapefiwoko.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87e17dab1d---75144062107.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/57767531667.pdfIn PDF document text
    • https://sealskinz.ru/files/file/28636014414.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3f565444---29599887470.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vabirixujej.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tadobirulasim.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/85323440436.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/xuperorinowebinoki.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/79131112430.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/zusibiwonozerun.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/73a965c8ab78f6a769b7107db7bbfcdd/xomesurusekedarujemapija.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/i09ausa6dlf11n88pqn4cl9t20/xoxokowarupo.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/vupetokagifatudalamisep.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d973c7a1bd1261a9c41f4cc2bec69b0f/vunesibijelotefa.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/dirabivetilitutipewo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084c16482380---nivufirevenev.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfecb76c7aa---79010769748.pdfIn PDF document text
    • https://orrizon.ru/images/file/86421811917.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f016eadeba3---13650292105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=organizational+buying+behavior+pdfPDF 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_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 11112 bytes
SHA-256: 3135a05f134a96c0ccf471f1f90bb614dbaea51fe4be3a50c921e70ae07236fa
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 15784 bytes
SHA-256: 80a78d1a06e7d5b10e46a07759075ec49d01156f4c8ad6196e60164f4bce9894