Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5090e3deda447ae…

MALICIOUS

PDF

91.3 KB Created: 2021-08-28 15:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e74d64eb6740ff1d2012bc6f872ac3cc SHA-1: 2dd3608044130059b6ae1a3b544745076e10ca9e SHA-256: e5090e3deda447aeb0c42031def51228ab488908f99378f85ab2a28670e96e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://cructi.ru/uplcv?utm_term=one+piece+s1+ep+1 PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c0685a67---94205742832.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/genomolupa.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/vulaf.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210822_912B440513FA7C75.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d546b45ca9---wumawetaraken.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gimiqps43ruf6fog46uukat0uv/4418918488.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/v5h9ujsglf3kq2hfn7c050lf08/6174438392.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/lezigima.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/74bjlk50b5g98c5iqhqsgqflql/tagupetofolemabow.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/45758435174.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/4uus96kl9u5cr4o25iunmh7t8q/dezakaxom.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c11a03391---38011081398.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073f72082b66---zojasufatowupetev.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/gibogizo.pdfIn PDF document text
    • http://e-district.org/userfiles/file/76356035523.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/telipudorogatupazaji.pdfIn PDF document text
    • https://projetovm.com/uploads/files/25551377889.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/mipojimorudosogaj.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sb49cnlupm9lqvd60lqs4clg25/joxerabolipexowulu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161009882a8e72---muxogetol.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/noxopetogalujupotijegolum.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/99172802380.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086f7b344bd8---55871218583.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ba3cd7e5---bikabitofutunokupuxa.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_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 19956 bytes
SHA-256: fd8283ce4abc6187f12bea49f662dabc905f733392968cf3c7df05fc67836729
font_01_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 9920 bytes
SHA-256: 3dba5c401cf7ed3a3b5da562cb834b73c780eeefb099e8a85446d0d9908ae502
font_02_sfnt_off00014852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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