Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fef3d4d7468860a…

MALICIOUS

PDF

81.1 KB Created: 2021-08-16 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67887408d6840ef440923d551d834dcb SHA-1: 4c216134914aa103e4dca110d550318154a86e2e SHA-256: 7fef3d4d7468860ac08dc7b788e9e49594d939fbf990ca8337477e64bfa7cfd8
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. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=convertir+pdf+a+word+online+gratis+sin+registro+archivos+grandes PDF link annotation
    • http://kartinatv.org/uploads/files/vaserilokijek.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/69031427534.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8100b852---fapimabodifovoxidideki.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/buvivexesupitij.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/31622441924.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sajugu.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/16962546323.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/16912343067.pdfIn PDF document text
    • http://skisun.it/userfiles/files/44499687839.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/83559547789.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/diwovufujeneredejizekobi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c17f58958---fenozuwitomexixav.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/0974s1k07rfhbsj2rpgf69l4h2/88769043360.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/95728923567.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kumopifuzoleto.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd692c28e5---47289237496.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/mibupubofibidoju.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/98487558139.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cad1b96e2---65507233055.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/15395847388.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/27gvf9rmrhkahg7a5ivjkmm6a0/25792784556.pdfIn PDF document text
    • 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 17928 bytes
SHA-256: c28c44055f8702f41f599a2f2c22ecdfb65a41e1f1defc875b1d604b98110db3
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 11084 bytes
SHA-256: dcacde71140b0f8280f0cfa31747d30867c5bad46950f3cdfec83f398b494d7c

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