Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a53cea1a86f9dc…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 16:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3830a0475dc155aa484ad72ae9e72b51 SHA-1: ff789cb0137c0148ffe654fc72d8c83b93d6f57b SHA-256: d3a53cea1a86f9dc3ef623b2a80492ac233a14f0f90cd4f33c98194699b7155e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URI heuristics and compromised CMS upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5698

Heuristics 5

  • 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
  • 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://ludifrance.fr/userfiles/file/49808412747.pdf In PDF document text
    • http://nextgenship.net/upload/file/20210620162420243784.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gabidafoja.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/83565191280.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/16032323267.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5ecf55b9a4f39bf256a596830e38310f/lilemelugazuxuguna.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/ganudom.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8235c2baa---8209609174.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/xirum.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2c64f32a---sewakalexar.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/69910453641.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0e0ee72798a8fc7665615e3043306ecc/85436998633.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4afcc5cd---15986388927.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/luxerononev.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4de3c193---bilisapu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/40422106824.pdfIn PDF document text
    • https://negaratoto.com/contents//files/dadama.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/81974825931.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690deb42fe---vosiwarolava.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/degoferuviwaz.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/70600751805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hobbes+state+of+nature+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 20032 bytes
SHA-256: 62500cc1142234413d974de704c0bdc95e9160489eb220d0f823a008d026aaea
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10584 bytes
SHA-256: 1b669b4bafc6e51ad99dfb3f7eb51df51616550896c1152ac2477d04f6a94839

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