Malicious PDF — malware analysis report

Static analysis result for SHA-256 202a7836dc64dab8…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 22:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b31d5b9286b5f8856ac88d3ee47f925a SHA-1: 0f77591205b76204bd39296ffce1439560a976ee SHA-256: 202a7836dc64dab843d2ba3d064e40404badb6ac34d2cdfe1402636d3ee80a11
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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://synerhu.ru/uplcv?utm_term=indeterminate+forms+book+pdf PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d9ed194de2401cb25c9eb89e52a9ad46/48276486875.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5d6fd4b13616903df7c153d8a7657ead/8389222581.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/64273652986.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01b60de72c---mefadivu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/sesugoj.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xamitatorudifanejiv.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/bamowipuzijabisuti.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f7aa56a6---rubexagumisawubesa.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/luwemebitafemebi.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/10573481592.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7dk756vvaeplqa5c6c3qvvb5gb/tokexipapupedanoxuxejoti.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607361fcf19c9---51009941106.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab8f03a9b---fipibepemu.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/sekovubusuzajorisirolib.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609457b6560dc---2758190580.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/gafupakikesame.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/l7am7cfd1d6t7fhihb7v77l97u/94398482466.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49e4e4e5f---15461464908.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73061525c0---borodobodopivinelimuraw.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/63121533014.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/482c2589c4a25800b5280026b7047141/kaxawokulutifaxujofadilu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/44484820036.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7cktivnvtggnv6a5cqnecl2dk9/40609957516.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/zuvisexexifa.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d0504d8---65774030131.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/meveb.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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 16828 bytes
SHA-256: 0a5d3a1c8fbc49feb9015814bef22512e427b550f0a86a670e0d0d3ce93cd43c
font_01_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 10796 bytes
SHA-256: 254cd378eaa4e1b9679e46eb9b5e7e33e4d6a223e3c5ed873cfc1f94de977f06
font_02_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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