Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c6ec5e4a375af5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 00:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e27988c0ceac9aeb8b418a89de0ebac8 SHA-1: be72d05ac6cdd08c25b7924e51903d70c4023b22 SHA-256: 48c6ec5e4a375af54780862e7aac8809b6c3b35fc85e23154d3abacf60453b07
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, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access vector.

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 http://edilgroupdigiovanni.it/userfiles/files/23691918916.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ba611581bacf6fe9a798c7a85f79696b/98590977912.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/gixurusisubomuguzasenexu.pdfIn PDF document text
    • http://3will.org/soubory/files/22362481136.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bec3fb9c873572a7fe93d50610e16c31/joguvotalonetunopawuzuno.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bc43046dfc5aeea47932ee7401c66d65/8776893662.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/widajodixolujevurekoju.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/be8d91b2a5c7085287e641a9f6672ab3/35820644539.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/95645364639.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/265e7d0e118a69ec138af46955d8bafd/37450665075.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2c877c6c---3742797681.pdfIn PDF document text
    • http://erdbau-rauch.at/98610261810.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/nabekodofozetapobobov.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/48157244666.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/lukofasodulofunizitajam.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/60698644761.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kenaso.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vk8f8hsnjqc14prfr4ct8s2amv/pufunutuxuzupezajojukenak.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/79495100112.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/98587476628.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c0dc757994b4e33a9ca117af4d5786f0/fofoteduganexamimuvo.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/fukivopositimakelitun.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/gefigux.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/datasevizunavabekel.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d57539875---gawofumidijijekidodefud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=earthquake+survival+kit+list+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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 16720 bytes
SHA-256: f980754a764568651d7c7058ecee032bcc57c21b9eb09026cdd7df3d75d62281
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 10760 bytes
SHA-256: 12f50fd41cabd34d80df8cd2f7bfa18608053282f71bdb1dbdf8faba6153cc08

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