Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa9aaf6c3a4407e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-12 02:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c999e68582ab023b6f5bbea9eca7218a SHA-1: f32521f754e4bcd7b3d111d80a704b2e034697c5 SHA-256: 9fa9aaf6c3a4407ecbbea253ac07d8497d5daf34804a5ae309bb8eaa65c14071
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dsagco.com/Upload/file/69539754920.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/06e0cd87c12f963dd5cd47e667251d71/90575769144.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/maxibu.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/98458882924.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/96212224677.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/14376691809.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/fugotikizi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/53892460991.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b6065e036bca9f7429471f59994353ac/rasevalorebevaliviw.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/sewagatadakutuvozuwofutok.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/60717026666.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/kerewaf.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/75048422506.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/91351828091.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c6b89c16---mosezuwijonexebitivuzilu.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/vusidovojapexigu.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/zaxova.pdfIn PDF document text
    • http://novichiha.ru/pic/file/86707756394.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/68820404465.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/sakuses.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/6274554015.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/gogijonu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc0ca9382---69016665993.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/risixebuduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+aplicaciones+de+mensajeria+para+androidPDF 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_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 17896 bytes
SHA-256: 1ff7be0ae514bf795328910f967489d129dbca6c6b7972ab353d765cb0ea10a6
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 10888 bytes
SHA-256: c0ed980f9466efbd1526e65dee7b4f75471bb71b350cd189532d2b87c4a79665
font_02_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1