Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c63eb3f71258a9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 03:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff090c4b91bff1d986b5333dd60ae4e1 SHA-1: 1ef1410fa5592ae2642a4212da29f768dfd22fd6 SHA-256: f4c63eb3f71258a923ce7531d1be8ba575a65e2c3ff1acabd7e12c9e3a3f8f10
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=justice+league+the+new+frontier+watch+online+free PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454a3ea6a3d---11681725751.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/94140821592.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6bfa3c64c3e7151b811f71e1c126a6aa/73429843506.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/90163714936.pdfIn PDF document text
    • https://fultoys.com/userfiles/32603680380.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/lubugenarogotavunigite.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/45237453540.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/lonilumelasetuwepabevot.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614259b4e1143---pifixixurilonugezavo.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/86406783100.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b5e1c28ff404750158dd22bd0cc78982/1393116649.pdfIn PDF document text
    • http://chineseclothingonline.net/File/xiwad.pdfIn PDF document text
    • https://profesa.net/userFilesfile/soputunakev.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/11600694035.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/93883874622.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/butadewaxinajum.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905100413519631.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/93572228875.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac6c66995---nipadijeletizev.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/7813250047.pdfIn PDF document text
    • http://dakmet.pl/upload/17552058057.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/4049308527.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/25379257154.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161465e275af58---83506477786.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/nukakarufum.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 18336 bytes
SHA-256: 3c757c12722a013d3f44ce39bee5abbee0d45c5ca41192f3e8181e221a7cf52d
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10792 bytes
SHA-256: d88b35628139375b670611bd023be32bbd862ad8d8d9eda13c494c95f25b121d
font_02_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1