Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d9aaae04ffcd27…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 13:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f75313f94970724183b721469262615 SHA-1: 5dd287827edbec2331090d11754658ecd743506b SHA-256: 45d9aaae04ffcd27eb128325f56b3ab14b13e7262c6a81caa088f9badcea537d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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 https://serpavenger.com/ckfinder/userfiles/files/faxizalat.pdf In PDF document text
    • http://kangshi-you.com/uploads/files/202109090004218791.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/25852241485.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/bikere.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/zowatewidewarozaxitog.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/vojudedobidirinase.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/koraxulebokoximopotas.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/54639098232.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/37379507153.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/pikotakoxezed.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131852732a18---77191366612.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/jafelixojilalilegux.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/64811638985.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/70859671535.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///85746924120.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n5pmrvsgnahrvll6g7168fo848/pipusonidupefajumo.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/10180155163.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/10044303359.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/xagogi.pdfIn PDF document text
    • http://ave-france.com/pics/files/15374383382.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/varizixotulubipoka.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132838a66b8b---31614019636.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/98785908021.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/fawuneru.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/garixexe.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/kotedukipon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+deleted+contacts+in+android+phonePDF 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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10872 bytes
SHA-256: f072af81cb28ad933d4c9fde0f93a1e1f4dff4de4ba00fabafb2c10f7628617b
font_02_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 18532 bytes
SHA-256: 3443b2403a002f855364dfc92cf78eb313139f262b1e368cc5cc06503eb36cb8