Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ada5c153fabfb7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 21:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06486ab1988e1324ee1ec051cbc1ea3f SHA-1: 84d335b882d190081d6e3b598395a794b9c6937f SHA-256: 09ada5c153fabfb7b884595a6c1b4c47f9319f36ad0f05a48402a522c04f549a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, many of which are likely disposable or compromised hosting. The primary purpose appears to be redirecting users to external sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=access+google+account+android PDF link annotation
    • https://mcsfood.com/images/file/manaxemuvirezugut.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/zofutakuzu.pdfIn PDF document text
    • https://j26clean.com/upload/files/68235826101.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/36268123385.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sofowuduzer.pdfIn PDF document text
    • http://hkacca.com/userfiles/fanuseledavexofuno.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/tanudavutoni.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161498f56a9f9e---zoxaverib.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/34463067519.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/sivazo.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/dobesasojivaloworixax.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109061845558146.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/e3505768ed906e18db38d851ecef5c79/33951885300.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/c5878d8f0be98c052e49e29bdc86cad6.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/nefazav.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/73476495641.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/wesopuva.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/47134597293.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/zetowonupogolatuvusixo.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kezevigigume.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a36f14465e0027bf80bda33eabeb2bc6/41840116950.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/79709714805.pdfIn PDF document text
    • https://alutat.com/data/file/56122757964.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/83691006052.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/87538538976.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/ganugetuvibewikopazeb.pdfIn PDF document text
    • 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 18468 bytes
SHA-256: 58e03d4c8624e6e3b6f4bf3953e2af1320daf4abb60f4da0144e74c91a8c353d
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 10628 bytes
SHA-256: 248841ac866e01565db67aee410393b01d5619fbaaf614ce32b7110de82765a4