Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75b70100c00d8e7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 14:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e0ade1800d2e73f1ff6e1005af11910a SHA-1: 4534044e354f39c57a8c6c8bf80a0a0e5aa42110 SHA-256: c75b70100c00d8e7f71caf0a6b6b66a98856666a2f347c53cc2b8e4fa8acb229
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=sky+clouds+wallpaper+4k PDF link annotation
    • http://robalton.es/Albums/images/file///ratuxe.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/viroxogoledi.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dowizamasudexuxodokasavu.pdfIn PDF document text
    • http://talesma.com/E/file/45191275527.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210918_CCFB541D21D0A469.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/ratodo.pdfIn PDF document text
    • http://nanopena.cz/upload/file/nizevafovojexososos.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/80313406648.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614669f848a09---netarape.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/nizolupejataka.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/vexedika.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/3928464562.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/26010294278.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kiwupubuvebobofuxoxala.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/gejeguji.pdfIn PDF document text
    • https://shidoremicrosys.com/media/gusadotodipipifoxezokasiv.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/49156222894.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vintkldss4cs18k6v8aqkcceb7/xamasunitop.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133142456215---8999190642.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/malobobezogiwepazo.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/wusonamibeba.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/84292413580.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/93058123643.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/25218300755.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/748305b4d6f569d70f055025c000a15a/semaxegijesewut.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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10756 bytes
SHA-256: c82dedd9f464a8c20fdd920b0e26c5b5311b7a637a713f07c8623ef4c9686c0e
font_01_sfnt_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 16288 bytes
SHA-256: 1fe7a5e2c29fa22194e6e3ebe155dd04b8c89116c6591108cc21794a6d3f7142

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