Malicious PDF — malware analysis report

Static analysis result for SHA-256 34eda60eca52bdd4…

MALICIOUS

PDF

94.2 KB Created: 2021-07-19 12:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9a6e4a5e718545880cbc87b5e81deeda SHA-1: 2f5c36f35ccc834ccde1eef47a614fa6c02fa005 SHA-256: 34eda60eca52bdd403f3848f4431248408136861f1c2765f9b12cd047db25634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, hosting numerous URLs that point to compromised WordPress upload directories and other domains. These links are likely designed to redirect users to phishing sites or download further malware. The presence of multiple external URIs and the link farm structure strongly suggest a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qhhn94ai19dc7i2dlsia14j2c4/26565943198.pdf In PDF document text
    • http://ccforum.kr/uploads/file/1626259878.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/20295822828.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/28914688794.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2e0a1ff951290c87fd7b9fe549ab126b/42134005120.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/wususadadikiwaruwapinifo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062811581173499.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vugokosokorokiwomapipen.pdfIn PDF document text
    • http://zgic.ru/!upload/files/mowoperitubekuwibiwalalun.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/422a076256bec16dee6a93461c495b57/56995975213.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/39406240485.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/59570421829.pdfIn PDF document text
    • http://unsersohn.ch/images/file/zedariliguxuwipukivak.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3314f71b---50679872713.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mafudumedur.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca66bdbf54---xixevupajesapewe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2765d1245---fubepaloj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3426d532f---66130198366.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4kefb638o82tpr2o9sob3uafk1/bisojukopafofinezisevip.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/907704319609da042b39d5.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/83145c46407d8a6447e548530c4eb525/95440344967.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e6d4e2a7---norazabuneguxemiv.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/50848991007.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607795117abfc---77570794226.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd7022cb4607abc8d87ab7f6707d0b3a/mujenuwivuluniguda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=prony+brake+dynamometer+is+an+absorption+dynamometerPDF 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_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16584 bytes
SHA-256: b37c847ac546568d5b635f7307f72fd62e4688300872044538f56037f3b87f21
font_01_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001524c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524C 10852 bytes
SHA-256: 63dff7505fab99e93b658965c10b23588963fef557187b118d9b47226ca6aab5

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