Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18460b35667d09c…

MALICIOUS

PDF

94.9 KB Created: 2021-09-11 04:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b7856cec2812784f7ead9c414c9be981 SHA-1: 961e96e838c8f3575ce3ec4cf860bccfb1686d01 SHA-256: f18460b35667d09c1b0b3ed9ee7101ca106237b492a782e4ba6b8b4a794299ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are identified as compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aisne.proximeo.com/ckfinder/userfiles/files/46697573153.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132605e76236---34479410800.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vevanekokozejen.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca0d26b8c---83638494315.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/bexadusowekemoz.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vunuxafusugivasaxozun.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/14488104561.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/12743022567.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e64092e9---panumuwonefitaju.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/39780335292.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xixemevolalatomiwesu.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109082131274956.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/39766471955.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/56151735078.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368894ee9e8---nojedemo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9e09e982---fozupenaxagibujemamaxut.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613994b150784---38271047938.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kevafobotegokiwizidumarum.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/lavodinini.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210902_11C5351C02953DAE.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/bemexidosifig.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/ponuzidojagutaf.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/radakifa.pdfIn PDF document text
    • https://premiersuli.hu/files/files/xudasimodur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=std+10+social+science+book+pdf+gujarati+mediumPDF 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_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 11676 bytes
SHA-256: e4fe828ead26b679d2dbcee8fe30b2dc1beb36d7f8f44251fa0045e4cf54e981
font_01_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 18416 bytes
SHA-256: 8f5a3ffe60e3dd9a0789733177ee9ce13557a02412edf0ff6d4a82c6450cb5ec
font_02_sfnt_off0001559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.