Malicious PDF — malware analysis report

Static analysis result for SHA-256 9336b8741f679e7c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 22:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 113d52690caa1ec38ef0694eac5731ef SHA-1: 94156ce641d16969cb0ab5da84e57641f37b12a6 SHA-256: 9336b8741f679e7c6b80a3a74b9ceab0edeb34b02cdcd7c02cdf397131fc3030
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for SEO manipulation or traffic redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16216064226.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b43e1e313---fesonuxuduxulawitijon.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fixajufufobi.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/lisexaweg.pdfIn PDF document text
    • http://gekon.net/userfiles/file/85041913966.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kizokitonudobujojexokogok.pdfIn PDF document text
    • https://rotitelor.com/contents/files/nirebadaxopamolomideper.pdfIn PDF document text
    • http://aa-nusd.jp/34220511948.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/36233814996.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/85254760708.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/wededikulejinufap.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/50308934768.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/rovamafojituvorojepagema.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8b1ce6af---godubiranoxovagegigixonu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/buloregutowofulawen.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/59196380482.pdfIn PDF document text
    • http://agro-partner.com/Image/files/rizobovepikakuze.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/xeratezizidajijogebidorod.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453db720c75---riwirimoxikimawesorutolog.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/misezunemaxi.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xibumemexawese.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/46537313539.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a8305590---vovugugowirawurirabo.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/nukiroronasukalujajeb.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/31654782803.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/jijukovawigozurasaziwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=building+skills+for+the+toefl+ibt+pdfPDF 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_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 11000 bytes
SHA-256: bfb5d55d8e5b218fd22c0264ea1d467e1d6e800a91abc4db97832a0d5138bc2b
font_01_sfnt_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 15940 bytes
SHA-256: 8bd13abc9e262fef6f3b0d14d6439c224c38e10d2c5d236709d11aa56c04c55a
font_02_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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