Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3d9ceebcb59311…

MALICIOUS

PDF

80.5 KB Created: 2021-08-27 16:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a19c911570b2ad92d42734d410ae2933 SHA-1: 2de1ac4635c6ed97e2e4177efad93dba93373258 SHA-256: 0f3d9ceebcb59311d594f5d49db5437c2d400102fe7b74d8e3a27d76c61fce83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=good+economics+for+hard+times+free+pdf+download PDF link annotation
    • http://tafgambiatours.com/userfiles/file/jiferadolexiwozuxov.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124561463eee---nalafezof.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/bapokunumizisilotuxedux.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/9me86klkaf0au0ivepsmjltln4/zujijerakujed.pdfIn PDF document text
    • http://kunbot.com/upload/files/30524513417.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/22037261800.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/20548538725.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/41882913869.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/20153960697.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/91a0g0omrg3ktbp87ecfbt3g42/tozupadikagijibub.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/72540716169.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/54650243202.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/laxizawadaruzujik.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/rilolexozuvudeposebut.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/filuvidedanebe.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/47910086769.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/97737857740.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/wejidax.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/rotijibuwi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/46fba7f5bb22cd7dfab2dbe02c4c8580/kogiwuvuxabutewavaj.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/fafopifajemegilinaxaxor.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/povamikerowexopamel.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/92489551745.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/14010626581.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f4e6f17---rilupileroremu.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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 11008 bytes
SHA-256: 8f7009a4f65567f05cb3dd555f908a7de3ba2c6a5e058679eb099a5bf7dd428e
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 18760 bytes
SHA-256: 154b9dd626c266247b401c32bfd53cec04800420bb394fd22f0bb660696abca9

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