Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53e8fc02a48240d…

MALICIOUS

PDF

76.4 KB Created: 2021-08-07 12:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0921a3aa620fb748016d96bb3f78e6ab SHA-1: f5269c61db07512040427c6883c77e78b4c0bf65 SHA-256: f53e8fc02a48240d788d0a9e36bc17c3981c06fca2155a96251da71932ee7b2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f215030291---jupedewogajovetikir.pdf In PDF document text
    • http://meechoktoolmart.com/user_img/files/gomonofegufobobiwowo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077604ca9b98---97425392432.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zemebapofetukedataxuj.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/abab387bc7d7e503f020b35aca34ae01/bixerulevajag.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/senosukijenorerikixuk.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/metoteri.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/8089582704.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607630914474d---zibobafajifawamugimu.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/24553991134.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/50427913612.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vuwatolemopinupozafoweba.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/befe7ad541c57ee761618987f8631f65/16088957457.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/47fdd51e136cb3e7bb19706491b85464/bewopujofanox.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eoql8aqb087l0plgtm63lj19q8/46212899859.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/38322140458.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/makonu.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/48093367244.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4e228b0a4f3dc54bd60594c5e084c483/76228268566.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd32bc5e6e---noruranomiradogedos.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/ripalerexeropuzus.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/17810787832.pdfIn PDF document text
    • http://hainfelderteich.at/60842501991.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/olpd172s6jifkfdqbr4dnkiaj3/36922653794.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f065fef1---dotixefasakaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=religious+education+2044+notes+pdf+downloadPDF 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_off0000c4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16788 bytes
SHA-256: 758aaa63def33d2f6d549b8bf90cea7e55fa5bd96a404f923c9c635d8ba9fd0d
font_02_sfnt_off000107e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E1 11244 bytes
SHA-256: 10eb81788d654ce9620a24f56c5c895d56861bf1bb268f962abf303c4477a4d8