Malicious PDF — malware analysis report

Static analysis result for SHA-256 59157a8b1cd86504…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 09:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78f3295841e6b6e02e3a799dfeb291a0 SHA-1: c775889492eb83f496d3a31312ea463ea670c7b0 SHA-256: 59157a8b1cd865044516331ab2aed739f50ed474d6dd88b830c2f613026e437d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to potentially compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://ventima.ru/userfiles/file/gifagab.pdf In PDF document text
    • http://moriefrusca.com/userfiles/files/91052433168.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/gitilopatidu.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/kuzokovobor.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fojupimureliledosanagibiv.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/61884b80fb0595f205f98fa7082554a6/zatuki.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/7609059730.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4a98fbad88b26292300e859ad9102e12/tugefuwaziwawitinek.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaed18c296---87145339140.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/47528222608.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/86724590550.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_191149.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xozusir.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/dofabirimivuru.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/pagupudako.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/derazojevibi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613723045fee7---tuxosegagejuvevole.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/fanedodepupo.pdfIn PDF document text
    • http://davcpundri.com/css/file/tosarobozuriledidaro.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/53310879789.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/nusorufuju.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/losowozejekop.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/galavavuxifofotibaweraja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+android+emoji+comparisonPDF 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_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 10716 bytes
SHA-256: 6ccda9bed2f20c27f645f8353b58f8867a023c0f67e9732a54310e82e279db6b
font_02_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 18028 bytes
SHA-256: c25502f03da434e37929311a57259acbc73401f88341158001e7c1264370e98d

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