Malicious PDF — malware analysis report

Static analysis result for SHA-256 f470eb3a45f73ca7…

MALICIOUS

PDF

144.1 KB Created: 2021-06-27 20:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cde911e2354c2d0720772544762ca16d SHA-1: 27a339fe3033f44b35f2aadf5f4ab0181497d793 SHA-256: f470eb3a45f73ca79f6eed6180da6b3d266d0f6259905ce8d28239082702f7c8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709d173152---38506520705.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66189857732.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nuxaputafuxebafopa.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/30365842187.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/wadasadiwuxobunirulula.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/61bf5fb4e3a0579083c0feac6eed0114/68966626450.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/dikemofezezedefubedoz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e5c8a145---xopisafudiwugikugiri.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/093a688257e22ca5e35e41b6c6a6a9bc/kawoxotexajijojevozox.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/97947578735.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585c229b3f---wefawufolikebodovajodof.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca2f8e459---23651287883.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/34796704117.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e59c809be3---91714630092.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/31801523893.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8980f76ae7a35bf5efa4843f3bf6139f/norelaxixonam.pdfIn PDF document text
    • https://rezgame.com/calisma2/files/uploads/zexavur.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xilozax.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/67972424688.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1149ae526---30694172794.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081677c9f41d---sozudovazezagogipidakoxij.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e83c4102---tojunopen.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/zubufukisivifer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+money+in+farming+simulator+17+multiplayerPDF 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_off0001d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D154 11188 bytes
SHA-256: f11ca5b0cdea49496fd6e6e4cc05c58cd6e0753c8b8c57ba5ff01976f18a5514
font_01_sfnt_off0001eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBA0 17816 bytes
SHA-256: 51ee85073c338666e4e050268ea96e87e80c5fed98d9001ede35227803c05a0f
font_02_sfnt_off00021a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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