Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d053d7f479dd82…

MALICIOUS

PDF

113.0 KB Created: 2021-08-08 15:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 573f3f172b516c45cc9704968da61c8c SHA-1: bea9874797b33f10805e5617842f8a9c93560e41 SHA-256: 99d053d7f479dd82baa376909a6fd972291f2d481855a0c9670eddfc49302be3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://hpsoft.shop/upload/files/zapiriduvorupin.pdf In PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/4c1d239573c85b543ca0164684b96e35/gawekipewigeboz.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/bd1696d7f8b96db352bdf6a32a36f8d0/27396426878.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608643807999a---77335973379.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1d75feccb11d3fb6ea6aa4ec5bcc8d7f/75925317070.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/popasigifajutale.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/35510503720.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb864c0878---buremusal.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/lexeregazeb.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f71398860---zulokokoneniral.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/40489005356.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/liduxibenusi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e46b03b9d07a78dcb85e7809a5b86d83/ligena.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c4117d2a---fadogonatofowuwi.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210613141907.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o3188j9n0ph5t7gpdjf5toitdm/tagedi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863024942f2---50179801688.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f3a2ead5dfd50ffc939964bd689cb6d1/84807850829.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/tikivewodesuromini.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/29840129523.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/fagidiruzidutedagonad.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/rodawu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021730599847.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/2181989075.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/wezimejanodivaj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/regako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=madden+mobile+18+databasePDF 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_off0001544a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544A 18440 bytes
SHA-256: 2917cf6191e3d67019a54f5257cdd1ec02bc1d4c72c5fa0b2ddd24c4711c30de
font_01_sfnt_off00018562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18562 10704 bytes
SHA-256: 5f6a851b48fb1838170bc7f529cdc53e87241f65dc629ae3c6220a3d5c66f259
font_02_sfnt_off00019dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1