Malicious PDF — malware analysis report

Static analysis result for SHA-256 b303a4764b92e2eb…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 03:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac875e11e65306a2343a65a14656d8f0 SHA-1: 7cce7fe7b3c41a14b7a9b8c9680ccd2b9850cd3a SHA-256: b303a4764b92e2eb2da105ec601a55049cb150d9000c4aed943b886ed4d07156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=gta+vice+city+lite+for+android PDF link annotation
    • http://vektor-bezpeki.com/userfiles/files/rarixifidotivinumezofebi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f356fcaf49---44231203920.pdfIn PDF document text
    • http://4rrecycle.com/files/file/77195401947.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/959b25b30505c9ed5841c7dd1bfc6cb8/95785088509.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/lelobomuwosokujir.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/26103304080.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/87478201726.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210909070827.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e4e36cf74009b1624e3c7dbf90cc78b/xutufawiboxi.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/8709996618.pdfIn PDF document text
    • https://digireg.nz/upload/56295402190.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/wogezufaketabuzufipebuna.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1c665326cc9c94060e21f2883dc13c8c/15723046422.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/bilatulimolaxemamerugiji.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/madopa.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/lisuru.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/foxig.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/lesutevamuju.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/dazerog.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435664db287---96292772375.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/83c261365edd12fb2f4f132b976f7360/46104974221.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/96786337936.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_off0000bc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 10520 bytes
SHA-256: 186b63db3911b6933662c9b24896dc066730aad1ba5385e58bd0c21a671cee1f
font_01_sfnt_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 16200 bytes
SHA-256: 69d088e5a7204efca717c4ee727ae9ada8a8a7177a9e94096b3eaf79ba393be2
font_02_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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