Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de8ff69ea6738db…

MALICIOUS

PDF

84.0 KB Created: 2021-08-13 00:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9660530c814c0c0aea32099eea2f53b8 SHA-1: 0d84f049051dd5df4e7bb4818541734f8c8fa5d4 SHA-256: 9de8ff69ea6738db35430c15dc9f5b0a5d4c73a140684dd0f65194c6921e053f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mytopics.it/uploads/file/34520382942.pdf In PDF document text
    • http://tao123.me/pro_pic/files/38252117666.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fde8e244f477a1f9bf244022d235b77a/vubisesu.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cadf91bfc04---zitima.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/koxomasapelos.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/natur.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/33070386545.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fakaj.pdfIn PDF document text
    • http://lagrupacio.cat/file/sivowaniremexapurijomab.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb657bafa---82147439639.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/livakonusupav.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/megemazatalujizuse.pdfIn PDF document text
    • https://loctra.net/userfiles/file/mobopawanofa.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2526f89153d7173de13fbb1577ab05c4/76213752094.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91931356891.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kewefufoxowazurowerek.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a498e4ca0fe---golarujatapogovu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/73c8fe6435564808a13cfc72fd1de443/6523919604.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/pufalozosenerosaf.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/gegoz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7b6c7508d---novodofokel.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082af38ebc81---24610585265.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/witulemekijoribagese.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/savoraladulamodam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hareketli+oyun+havalar%C4%B1+se%C3%A7meler+mp3+indir+durPDF 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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 11436 bytes
SHA-256: 5e913a8992b8b340e9fa5e124dba7ecd408e16ed65912a318e490b736b670efe
font_01_sfnt_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 18412 bytes
SHA-256: 87539228f9ed188e8f67f581eca39b032bb324cb0ca65d53ada210026bc474ec

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