Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90f51157c78a852…

MALICIOUS

PDF

90.2 KB Created: 2021-08-10 03:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 033bcf69793bc9702d849e160710c7df SHA-1: c9037fa6756d143d65ce69682ec7e198d9138152 SHA-256: e90f51157c78a8526ea7bbf1bd2ac318aae7bc5b4496450d269f4bcfebf6c4d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm designed for SEO manipulation, likely to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/1c285c1bca709abe079e00b8e23ee741/jasanid.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06d0e24d8b6332a916cdc0b1d6d682e9/vanogudekolubapubog.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0dfeec8f---zadidinemis.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/zanebusasozuriwuxezuluv.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160764abbdc082---vejojugubefiton.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/950f8270341bf239b4cae4d4fcdc254a/42767437447.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aad053dc---67868568764.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/rekelodariritotu.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/79189752417.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kujiwufolodadowibivulipe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/734b00de9dd5d05891288bb2cfd9149b/bozijopobupexadupokido.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/98586450542.pdfIn PDF document text
    • https://estoniapools.com/contents//files/13459466176.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/xujezuvekedaxidaruma.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/47558305486.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/10758720366.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/zewovexidamorideve.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091c767670ec---65026715420.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/fijidifi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/011ad1e20f80079b03ce68cc41bce081/rimavukarupafiduvudojik.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607769e976348---57840916778.pdfIn PDF document text
    • http://akademibt.com/resimler/files/lanune.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/68412963596.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/18482147122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=to+kill+a+mockingbird+audiobook+free+download+mp3PDF 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_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 17100 bytes
SHA-256: 8f4d072d1287722d398c60f1be2cd468a45240a64168cb7ce3c76e0b463dae8b
font_01_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8B 11248 bytes
SHA-256: ab30088539a8a3681f94242df6111ac139f7db40cc4e4d91663b8829b462dddb

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