Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8650637e500fc6e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-23 09:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fabf9ccec346589d15bc3a3236e64640 SHA-1: e505e1d28058808d6941c697a7051ca9cf34d737 SHA-256: b8650637e500fc6ed93c5ae1908ab2c3e8a447b9514076b9a1acd3d84cd6bd9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links. The embedded JavaScript (T1059.007) is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=sinhala+lama+kathandara+poth+free+download PDF link annotation
    • http://gewald.ru/content/Files/mewag.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/5964439184.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/39309572851.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/17400695175.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210901_C7F2962F34DC9862.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ba2a24e48f1bb32620f5433a03b48577/buvinulajesosujobi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613006b5cb047---51735140005.pdfIn PDF document text
    • http://micruts.org/userfiles/file/darik.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/10064575619.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/luguru.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/4524873403.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/69963581331.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/40493550668.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/petevedimowejirigepagatoj.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e5253ce5---paxojoze.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/97496556580.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/48922907277.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316d7e63278---wazewiregopagetonidep.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/38950021363.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/43291854389.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/lemosazalevugit.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6fb47f303c50aa29f0e47794289d305e/87165139418.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lufedilereze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE0 16640 bytes
SHA-256: 38a46558c4df25846112c17e4206240c0fcabe179e39290ab18de918da194757
font_01_sfnt_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 10848 bytes
SHA-256: ea60e7c51f59d7adf8bb110030ab2393a102e4687c7d05893979d6ea9adc0d90
font_03_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 16232 bytes
SHA-256: b52e26f2069d952ee2ca17ffb84d790adaf5824093daedb373a05bc8585c911d

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