Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb496e14f0df2ee9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 11:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58fbcede1cdb6f0db7b85768508f7f74 SHA-1: d9707f162ee2c5679e7604facdd51556b9eb0c7c SHA-256: fb496e14f0df2ee9bb03dcf64ea1f32045680d480f9bc30dd6bc6aab1f8ac4d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicate a link farm designed to redirect users to malicious or phishing content. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://catamma.ru/uplcv?utm_term=how+to+make+polished+stone+minecraft PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d1da1ce7---piduduf.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/wamasutupudijubuxoxezujol.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7gftign8c75qv0hrbe7d1vclkn/13148443293.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b6feade4---59900345967.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/joxagejowe.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/wibupizimamisaxif.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/30519323300.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/275bf9e87335086a8908da10a5a17b8f/60342276995.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/gizapikorubi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ebj6t0pbe79lr1dpbkia53v8b5/24365751710.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67822287203.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/67551713836.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608332f8daa63---50986540046.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9438c98636d2c8eda8a38de4e97e2382/73387410216.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/xinigoruzusotapeputu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/nikufelavukivesaropagi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/27749184631.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fbf015efc5f3d2e4bf93019325976e82/42824642704.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/45740059720.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/nitilunezunixibotixam.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93d61dbbe---30697846847.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/a4euv1usaj5v27bucs01l709nu/519683454.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4b587a10b45e0906ee25b74a28dc87aa/79635614642.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/77822772900.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160972bf67b1ce---20960725733.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 17428 bytes
SHA-256: 0a4b8273d508af66708d81dc54f5ca2f2f10a93bc7f018ac67aa09d74a4da132
font_01_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 11056 bytes
SHA-256: 9a60513f28d1ff74b665acc3f4e6388607622cc52bf6191d9597f97c0d58e259
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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