Malicious PDF — malware analysis report

Static analysis result for SHA-256 29816256285a74b4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 15:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 456c22467f542f82d8e69b3fa5237941 SHA-1: 7ffb0630f25a5f3617aa18bfc20ed015a3e0bf1c SHA-256: 29816256285a74b48a6e2eb82e6c8a6f2559bf5bf48be5274c90d896f624370e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, 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 phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/aba7e14e09208e650ba9bb28231b0aae/43406570092.pdf In PDF document text
    • https://akamercedes.com/images/uploads/files/1232696869.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///sakasu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eejdfijp3tc8gosgvsbdjqe0p1/8624795792.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/66199237308.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/vevubadawoxebefepu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/11855945690.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ace3a6f056---sumefumuwisedekab.pdfIn PDF document text
    • http://gibisch.biz/files/files/lejaxanuxekisosazar.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c8bc27fb0f9dbf2ccb8140ba1d41990a/jepajuse.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/sigosezisiwemakinavozijuw.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kapoxixodowebixa.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zituwoxuwagajej.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/19k9qsjpel2ik0o50f2l5i3se3/gozalarepunuwuneserusapuf.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/28018654002.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/pigidodiremuzurewinawogul.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/jutadipajemukagutidikut.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/96281390459.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b9e3f2ea---fufumi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/nowukajadotaxum.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/lavakesuzexado.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hp06nit2b1hsmru7t75dn21oei/febutupepebibagekoxatane.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f88b4192---pediwak.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32096ebf8---53224671505.pdfIn PDF document text
    • https://istanajp2.com/contents/files/92168426581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=interpreting+motion+graphs+worksheet+docPDF 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_off0000c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13F 19172 bytes
SHA-256: 6c4bcb4a6e4b5defae3ff535a210d3460445a85e01f67668edeb82c41588a612
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 11044 bytes
SHA-256: 2acda7fdb7732b80c9e59ba46cde8b18e090183fb3f0cec3fbfce494aa6b9d0d