Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb9377a8ef518f1…

MALICIOUS

PDF

84.5 KB Created: 2021-08-29 20:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9458857e5ea18a6136098723b65806c3 SHA-1: 1618532193c9b315c38c39a9b2999b9aa5708974 SHA-256: fdb9377a8ef518f155d2a4d1a4b3ff3cdd54a60e5f05c6f5896b46de8ec909e5
156 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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cs-golfclub.com/ckupload/files/76619680543.pdf In PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bukafisuremekadolemu.pdfIn PDF document text
    • http://net-marketing.hu/images/files/rosedale.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6880d8f350ead70b56b14b0707a1590d/76240645389.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/94249062906.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a13594dd2---60143552520.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/37860708193.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/3380972212.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160801f46c277e---sorujekegijudatatapatir.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/4991663193.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/66667321458.pdfIn PDF document text
    • http://com123.vn/uploads/file/35422296324.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/87222683042.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/pavisuwen.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b508e476e38---41011763965.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/waxilaxigelolisuxen.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4506abff35---rusosulafaromubisufanuv.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af783d02e00---rerimolulonupuxa.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74d49037d0---namisu.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/vuxapewunofijomuji.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095a82c1b178---notafolovegil.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc24499ee1---74321634246.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/losoguvolabewu.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/78048707172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dr+no+james+bond+full+movie+free+downloadPDF 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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 10940 bytes
SHA-256: 06732129a50af171277689201d00633299dbac79a2fe7b7c7793736f2cde910d
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 17432 bytes
SHA-256: 39292a6d012d5c70e357dec39c0a11326dae2b6b803a6272aad728edf0d3d7f9
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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