Malicious PDF — malware analysis report

Static analysis result for SHA-256 148d2f921ec9bd28…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 00:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 290c6ef82c6be6f522bafae41ebddc92 SHA-1: bfa3bb4ec9a26afe0e493ca5d06ea17158b0f190 SHA-256: 148d2f921ec9bd28e0f8cbd4b38158fa73b3424b68cd2c86a35b43644a47c386
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous links to external sites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8a9ebff5f93ae8e0325e507b9afebb5a/kinonulakugotebumozido.pdf In PDF document text
    • https://jackinthegym.com/uploads/files/202108152216106170.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/9749365315.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/43140518293.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f9a7339529ef3e3c61d684476a760091/kelurolebagesinafix.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/08408027c9a570b363fe0d39d7ce2ebc/vogenulubugabazafoza.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xesivevufetigowigazeza.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcda889727---rixozedawenupoxewased.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210824_B0B90EAD5A8B01EB.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/42814397818.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b845ff1070e---guxagalaxaxubonosa.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/20994101270.pdfIn PDF document text
    • http://mega.kz/media/upload/files/budimenibotusejok.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1c4c8f661---62105634308.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7b855968a0d865df5d7598a44c46cd21/wugenegakimebojekipesun.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/70uki0aguln8874d8ipmei00in/53851658594.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/derefewoxiwajo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/23390817275.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e5688527---18689213043.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/12625470023.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/58743723933.pdfIn PDF document text
    • https://kapefashion.com/files/files/perexawo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9752049a16---55685951568.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6e2699adcb7dde654a84afefc4b55a88/lidapuzeb.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d0c9fcb9---lokufipufenodazowavagosel.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/vifer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=classification+structure+and+properties+of+amino+acids+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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 14316 bytes
SHA-256: 91c561186189b0bdc198eaafaece2621f8cf73124e10b6542bdb2bc5ef8a0479
font_01_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 10912 bytes
SHA-256: 58d1d530079c4d6181c63734987c5496f0d442edb1c00c0459e6a5e7b9595611
font_02_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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