Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c818ce8f68ddea…

MALICIOUS

PDF

93.7 KB Created: 2021-06-27 01:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff2ab43caf9285e8a79e8c22017a050f SHA-1: 989eed2d1f9d5b54a513ad5fb0fd13ecd3926fa4 SHA-256: b3c818ce8f68ddeab7d591de6ef0a0159f68f23af007edb3faa4cb62967be40b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://media-get.ru/userfiles/files/rewelodepabaj.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160813f40414eb---sileladanurokujeru.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gh1hthlue2jo7lv6kmk9lnn874/57997732411.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c447f52bd4---nevonakusa.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/q7g4scojmoin9ct877hd9el3a9/9149923581.pdf
    • http://salon-urody-bellis.pl/images/file/duliwoz.pdf
    • https://fokusmedia.com/images/uploads/kagulonafibi.pdf
    • http://mcutech.net/upload/2021/06/file/16246483281745391362.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca08a2a9a---88559631367.pdf
    • http://romanakladatelstvi.cz/userfiles/file/waburoxewonadozewan.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0748692cf1---63824488525.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e16ee746fe6a0dc220b6defffdba4d6e/wavafibasapakofowo.pdf
    • https://amblamy.ee/upload/file/kaxoregopavupu.pdf
    • http://lbtech.kr/upfile/files/fukogiwasipenuvoginikuvix.pdf
    • http://langeline.com/ckeditor/upload/files/43918755819.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608381e7e4d43---rimugagegupoko.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad442c7cc---kepidipimanubulupovu.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/6ep90o5st38hhca4kgb9qqsos2/mipeji.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac853fa03f1---pasaxutuvemunulafedetefo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c5a422b13f2b2e81ec49104356588ec5/nenoxeka.pdf
    • https://jdlpartnerss.com/userfiles/file/34470026446.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3bf1c280---gubojaxoguzimafemijotu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b43f14a6---7718145332.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/vokidajifa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=blue+jay+calls+and+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes
font_01_sfnt_off00012310.bin
55de62f63c8119b2bc19d295358596f2424184f5b7708ef7d57abb361810a10b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 10652 bytes
font_02_sfnt_off00013b69.bin
b4ac85968883163103b9beb1a304b1fe0d3e208f63f83bbe64e41c8f4afd83a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 17604 bytes