Malicious PDF — malware analysis report

Static analysis result for SHA-256 e075379a66eae69b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 07:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba61b87c09e00d237c69b1a76b52b5a1 SHA-1: cccd5ed9b19066bcc4aaa793c2dc4d35a849d988 SHA-256: e075379a66eae69b6bfe4a208c29feef52468f433a4f488dcc4af242f3882822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecb80c0a57---76951984274.pdf In PDF document text
    • https://healthmatters.me/userfiles/file/27835321245.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/25502767192.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/69523700819.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210906050758.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///83663829331.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/33756847755.pdfIn PDF document text
    • http://pedraferro.com/files/files/kalarobafulokiwanar.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/54734370105.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/zenufowinomerumesowenubiz.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/xafewikutujufuxeguwudi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42cc30c61---57776664118.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109131710425906.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/pusefawanojer.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/66203094872.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f771c66bc87247c27e3b26d7397345a7/jogijudaxipi.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/3743473557.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/lopawabulegapolom.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/letumateguteva.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/34921434030.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/jovumalov.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/n6v103of7qg9idd5v861sj7n5b/35875762639.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/23212805836.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/suvoriritogazuwiw.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/67081273079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+lulubox+app+downloadPDF 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_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 10332 bytes
SHA-256: ff1fa16a99eb682897e843e57dc96edf43b0f942d9f1d306e1eaf3d401747f72
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 18052 bytes
SHA-256: 18aaa19f46686ad105307954785e3918ae4ac53588e710924ee7bd3ec05b9155
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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