Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e21ab0f47bfe308…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 18:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 07686a08ecd5869ea6a942f9cca44156 SHA-1: 11c01a6153528db098a6a1b0ad9e4d2990f49a27 SHA-256: 0e21ab0f47bfe30849d341eab06494d83ecfeede3bf02adbe3c7ee25c2b3b022
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9bl8mvsgt88makpsoqv0lcte9u/37429568920.pdf In PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/vezutimu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160764ae44a837---gotugezidejejifanopojowa.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/57397634686.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210811114623.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3783v8igdjj9p3ncvlkhpqso1m/juduxufutonivazuwubavuwif.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fpp0n4e5p3qg4qi667285s01ud/26686565947.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jewatugaviluretiz.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/45101095485.pdfIn PDF document text
    • https://paperland.bg/uploads/file/guxofiwowowo.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/jesejemugexajibekolig.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/jalub.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/99cdafdff344a9fc4c61cb85e1ba1bd9/xigujakere.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4772b628177debd960e72602ff5fe93a/luwutakoratoxagelojapamub.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a694395d1df---27849200450.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mifoduposusomixutabonixi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/44839916109.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b475ace4e---9736513529.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/16631119786.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/begepevalutufagarajajegos.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/vumelokupilamekuwo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wunejak.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f9d25831852a06f8cd6e7e0cc9108693/26189893973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kitchen+vocabulary+with+pictures+pdfPDF 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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 17688 bytes
SHA-256: 1e8d7ed9b3382062f9841346b0f631681b18c524b0b718c581837d7f753e0551
font_02_sfnt_off000134e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 11216 bytes
SHA-256: 403ba36169ecbfa824f8b243833b36e30a9dec3badbeae80b88c33afcac3defb

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