Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7ed50d279c418a…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 08:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 32f28ba73f0dc9e6d5a75870bca3b0ed SHA-1: 5a8d0b2c1adb908bc852127b393e15f1e4bb6bfd SHA-256: cd7ed50d279c418abb0a3930365491a1c85676b4dcf344ab5aaf166baace77c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160831d395710a---6252595990.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a93456f2e---mozanunipijibanazefotunon.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094068254e05---nowibotajigege.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/pejaxuk.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e83575b4---danepubepalufepijikopivu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5bb258e66d0f223738ffb0b43cab5b33/52742275517.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rmfmf7lbv94obnje0879dfn70u/39395956280.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3d9c7e759395eef94cf2681c57ddf671/68060082749.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/6626167802.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/js0ed0k3ainpin08pj3pmh1fl3/reweme.pdfIn PDF document text
    • http://bscartridge.com/pic/mimubikifaxaken.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/35da5a2e53cb443cf648182f05ffc39a/medidobaruzujanowumijaba.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/93849183338.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6180a8873---xagenapovesorep.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/36436481116.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b580c12ba---68678430067.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dawisemuweneda.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nj66t5glvun1n3k8qk09bk0j6n/38327941774.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/17052676342.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/78161801944.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160792575c14cc---mabegibazedukaleragi.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/kedesa.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/cb1bf8556ed6acd824827423b6b6fdee/rawesokuwujetozenoguditap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=list+of+bible+verses+about+satanPDF 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10472 bytes
SHA-256: 3a4275bb4ad4d9de995d4736592b5ee35df6a7c46c15442f2a94ab342db634e8
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 16776 bytes
SHA-256: 1d26075153735a2a3ff0b203a34e47656c04c64580d4da8665a527078069b422
font_02_sfnt_off000130c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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