Malicious PDF — malware analysis report

Static analysis result for SHA-256 f633898027edab3b…

MALICIOUS

PDF

98.6 KB Created: 2021-09-09 17:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75b4b5f9fe036feab6cad72343e2138e SHA-1: 92c221fa9721a2e30308cdf13d65668b70c7227c SHA-256: f633898027edab3b6c6b6e55f8ea7371ecbd31da7d607bbc86907a0bb42d2921
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised domains suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://ctapigroup3.com/contents/files/40494262485.pdf In PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/65212666834.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2cba1e3969bfae0d270ef72f71f79d62/8927179281.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130accb89468---kumutepira.pdfIn PDF document text
    • https://krossi.ru/images/content/files/kotirizebati.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/sever.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/96062200697.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xitamopaseg.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/15960782635.pdfIn PDF document text
    • http://vladekoservis.ru/files/14217198126.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/26225085963.pdfIn PDF document text
    • http://afro-safari.com/upload/files/rixopiporiso.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/diruwuzirawotululimasisi.pdfIn PDF document text
    • https://robodom.si/files_vsebine/fiwojumo.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/kunovibomolajaga.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/71226492598.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/togovadox.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136062d8eba7---moxibojonomufasojegirag.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/xuzomuneteweputabujev.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vazexiliginejodo.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/sizaxekuvimubugij.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/76617100983.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/40634975335.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0a05b618---63001148735.pdfIn PDF document text
    • http://chongros.com/userData/board/file/1578993126.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/23224921987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=john+walkenbach+vba+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_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 10632 bytes
SHA-256: 46b2bdc932b169501e97aa16823c2e40dd3cbba4aacc15533e4e9703e3b1d27e
font_01_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE6 18288 bytes
SHA-256: 80ac96a2531d46da46e66c3917d34f688f58994cb28d77e94156363dfb38eb74

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