Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d48b242bc66713b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 12:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4126948016f87adcb8db633885da19d3 SHA-1: e27b6be89ebabd9602e2125e63b41c8ae77fe335 SHA-256: 8d48b242bc66713b17ee0572ab80912f56e3de9c18c4cfd51686ff54ce4f2bbb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pet-fashion.ro/mm/file/wotubegetagixas.pdf In PDF document text
    • http://ekmeta.lt/failai/file/7886089823.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/zetudozejiwejol.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b1ebfc90c1266bc271caac1e94d0ebd7/38769207459.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/43494656803.pdfIn PDF document text
    • https://fasaac.org/temp//files/55974253163.pdfIn PDF document text
    • https://xigmatek.com/upload/files/womosita.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3e40db21---rifevojososalat.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/62877307523.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/30400924597.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00482b2fbf---vezowizitofak.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/79132284699.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/86947248258.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/d88n8hsdeeo4qpm1ba815pbqdp/43491088434.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210607060350_29ar5v.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/57057064673.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/73903177795.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a60bda65b15e895c9f8db95d0614b63e/sakimijexevosijis.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/52444642092.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b162475f7cc---bomefez.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902001334.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/51797443153.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/24tdtpll2l8uuep59dt500rp2b/31957183778.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/binopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=la+ferrovia+sotterranea+pdf+gratisPDF 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_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 10652 bytes
SHA-256: e3bdf8eb928bcaf7bbc3c2958ea0ea2e6a9f86c38b2331aa96bcb8cdf0e34e02
font_01_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 17144 bytes
SHA-256: 8e88c699ed18393ccd844e86abb90e527f16e404cb2e1e0d2ba4a750cbbc038f
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1