Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7a711222bf76e9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 15:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f7c9e5e23a058ce5cb19e4e059382b2 SHA-1: 0306464235bb0f9cb22b17e8f2074dd5b77bcf78 SHA-256: 0c7a711222bf76e9c165ec71454f11f54bdde7e8a31c6d477affe3dc1bf4e121
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • 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 https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t11ue62ka53vjsft8cqr55okc1/karaxetagijiginijusa.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5acbbb4e---texabiwimafofuxiketipukit.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210830_DDF2A4152EA62ECD.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1e661cda47573b52e2e88108ef8866c6/zigopubenuzakomu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077525788b84---27968623680.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/oiets5c65it33l87tjdt9ob9l1/13722226865.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/97036017692.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/32227353272.pdfIn PDF document text
    • http://fitviewer.biz/files/file/73652663995.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/12566122108.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5e97245d1f2dfef920d53f4096f5f523/47723576596.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/seluget.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/25611047519.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/27924713432.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/28937494583.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/73184651647.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/47879542516.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/xufenadoludewuzub.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7963771fb---13977620936.pdfIn PDF document text
    • https://plasy.com/uploads/file/56192051907.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/93575752648.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/73738608323.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/defokigij.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/17325735556.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc424b3a29---1404835709.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8fhie2vfn1fs3btfoqvejmedi/tadirepidebefave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tierschutzgesetz+2017+deutschland+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_off0000be97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 11244 bytes
SHA-256: dde8a159d1bd9d87746f86eb64b7bf761d92c4ba6fea8b4749271972de4eb965
font_01_sfnt_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 18308 bytes
SHA-256: 9a00b05abb5c94f5f582046012ed4dfe6f7a9b07211ef81f3301b23b25737c80
font_02_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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