Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f08ad959cc41d7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 15:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c2943e9ad84b058855f5c17947ea5372 SHA-1: 48c2828acf46958781310cc3c02ffa3b1b79216e SHA-256: 84f08ad959cc41d70885d83081e01ca4029666f720d45876b0b82906343b56da
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable due to encoding issues, but the heuristic firings and URL analysis point to a malicious link farm attack pattern.

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 https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c571114e8---xajara.pdf In PDF document text
    • https://cebrium.ssnn.ro/images/jobezafematogog.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/kamerakamigewiluf.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/60944879112.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/sazajipirobusimoxido.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/92111161381.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/nukuxexesiwavesoremega.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/p8blhshpb5ngcakdateil237f6/gufefazuxe.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/75569795317.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/30266557175.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/693uj05u48unqu41vo8er9e256/91343456931.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rb6qnhke2edvs81tshd5t6diiu/83655760982.pdfIn PDF document text
    • https://melz-feu.ru/upload/xexaxiwad.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xikufonofexoz.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/88967253159.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/74653278045.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ef3b17c2a4f234de275b2044f1947e4/43790565681.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/dojibekeparuvifibuzav.pdfIn PDF document text
    • https://goodline.by/userfiles/file/34658263973.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/67400103203.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/74263251059.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/38a562834f3b54baf444f6425a67f00b/kijefemujibi.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/11213632093.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/magon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=laputa+full+moviePDF 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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 14600 bytes
SHA-256: fc3e14d93d31112c1c0dd835fe40c68ff0192cd5df4ccd7ed835ed9bf9197b41
font_01_sfnt_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 10272 bytes
SHA-256: c3b0e4958dd51582536e4aa5eaaebd1ada1a8a12c97e3d9bae5424a7a7402623
font_02_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1