Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8b3daf5f198157…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 12:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87ce45be676b4570ee1577bcfafca755 SHA-1: 6ee9b46bd4ede26a8310963c70866ffe98948a8a SHA-256: bf8b3daf5f198157dbab78642c141ce15b8c7741af63d486a9fa1ce32382e057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious. The primary attack pattern involves redirecting users through a series of links, ultimately leading to other malicious PDF files, likely for phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613619802c2ed---venirojezuvubagobekinezik.pdf In PDF document text
    • https://samngaimarble.com/html_upload/file/55268275715.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab3db6a51---84849273828.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_28B5DF707E3CFF10.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/70808836949.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/vidinif.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/labusinow.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nagufebodixotafa.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/dewufa.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/59011366086.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/89379484665.pdfIn PDF document text
    • http://centronegozi.com/public/nabudepapuwileteb.pdfIn PDF document text
    • https://kildevangen.dk/files/vuxibadime.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/95918714518.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/31750686721.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/rojimogiruvevozebama.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/nimuvetemideposozoxo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e9cb142d---mowubev.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xonelobupejol.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/68733984073.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51399619679.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/f6k5kal28n8jqtlfuutcshtapg/53137670894.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131fce52cbba---kudezevusubafonasimixozis.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/78309250158.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9113be71---zibesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=apa+7th+edition+sourcesPDF 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_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 10696 bytes
SHA-256: a8bd47ac7d14932e1aae8328f76c8ce82913b00fe324ac3b8d7779e7db67eb43
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 17716 bytes
SHA-256: 6a2d010db0a349dc6b983443dd20512dfb311449357ff56ed42ecf480b51ca0e
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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