Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39f1aeab66ad0b3…

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 23:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1309f06192e1616810442441cb66231a SHA-1: 34e7ed1d4d06a585428239164bb9ac4b8377e8db SHA-256: c39f1aeab66ad0b31345533945fe594eb842d292b0f4260fd989fb576057d8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript to redirect users to malicious URLs.

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.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6ilcbanib7p8vufhgf2r79n1c7/suzoxid.pdf In PDF document text
    • http://ecogestval.com/userfiles/file/11759033358.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/5152110284.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5d183983ffa2170f2a00c04c8215755c/950042365.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/85096936918.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/86275322333.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc5cb70fb---zofetonebakonafurorag.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4f0cfb9f4b036d0ab0ed87f1e69c76de/jawotufexofejelu.pdfIn PDF document text
    • http://zjlytl.com/images/upload/File/30256087526.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af95964c590---vomezegububi.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/78109751641.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/pozofovajepototodegurup.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610af3ad6a0a3---63534957945.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3863921196.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/85096434075.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1dd67986ef500cc0686eb2c1878a463f/zemapixego.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9236425a10668f6ed6407d5720209b40/55592054951.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kotaxudukudimozufulo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tu00ae512ghlul0q3o91q4la0u/89668404261.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8d8db316---diwivedigireferigoded.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/wutobutixujoko.pdfIn PDF document text
    • http://popmetre.com/news/files/jifawisasofimoretijek.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/47357516655.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/rawofofonadudutegexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=teoria+da+relatividade+especial+roberto+de+andrade+martins+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_off0000cdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 10948 bytes
SHA-256: 76bfd56bc59d35f69a039e875687becf328caaf104c6fa26dec9015a923cecf7
font_01_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 20384 bytes
SHA-256: e2b1f033b6c652a54d61824e5a63090b7f2e3e118bff46ef94f131ab3dac6aac
font_02_sfnt_off00011a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1