Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0e016f9d7f5b96…

MALICIOUS

PDF

105.1 KB Created: 2021-08-16 13:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 47e986baaf914e68df9151e4524e46c6 SHA-1: b52b0ff20941025565d24bb9343e664c9f819855 SHA-256: bf0e016f9d7f5b96cc16caa6f55815fd3905def29596fd2870c377413eceb3da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=aortic+dissection+treatment+guidelines PDF link annotation
    • http://slbreakingnews.com/ckfinder/userfiles/files/22788104962.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6a51379fcf5086eaf94e82f72924d71f/92473373910.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xafogesagepebipuvezeg.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/46425737175.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/nadapideraripulab.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/76005813895.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/7306110244.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/febik.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/sejijivegipidiba.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a716e62a529---tifadi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210731052143.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jraf8g0j4nfvdn1ctdkcbhdh41/puxirozefudewulalage.pdfIn PDF document text
    • http://asfalon.com/__files/file/42776954709.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bnn2vpohs9tsr0eprkrnn49ebu/73939199955.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ravepelemekilajedegejat.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/bd69kvnf9fjtjnvled1liksg7t/nejeleme.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/84sr46ad5huf1r8gsq5omt9jtg/nalumisiduxisepuzet.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ece4e8ed863c751d81a9e13075bba3c0/leroliposiko.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/bovesibuxixi.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/vekagux.pdfIn PDF document text
    • https://2acontractor.it/images/file/zamojekesa.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/32590475263.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/jogoxifuw.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_off00013863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001507a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507A 10792 bytes
SHA-256: cae2e6b18c10e42e5ac769afa1cdc7eecadc047e6c4a5de7beed45509c63a761
font_02_sfnt_off0001691d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691D 17156 bytes
SHA-256: 25cfce170fe85a6d09354947855fe8f0c2afdf4c2a04c43cb964e9ec065cd040

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