Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c7f92bb26c6012…

MALICIOUS

PDF

80.0 KB Created: 2021-10-06 03:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0633aa88baacf01d9abd5e4957620880 SHA-1: 88b13a34cf63b08ada3459aaf3d5a0d2d2c0d46b SHA-256: 05c7f92bb26c6012f3b60d3fa481f9f2c0173c7dd6fe7b1e2775a733f1fed0cb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7191

Heuristics 5

  • 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
  • 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://giltmorestukko.hu/ckfinder/userfiles/files/luzilanezo.pdf In PDF document text
    • http://devveb.net/userfiles/file/mewosidodutoxojipavamutud.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/44838738632.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210910_C019F7CCDD9334B8.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/37060399369.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/78609927155.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502d499eaf---28220855118.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/52655021951.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/kukiw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2534b947b---31642872902.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109172238286711.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/37974645052.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/13146543247.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155eaf841da8---24803552489.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/siwerebal.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/furovodapikirex.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155675b010bc---jofowanonegirenir.pdfIn PDF document text
    • https://novitas.ro/files/82823106144.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/44307420401.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/44357124721.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/pidazuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mp3+download+holy+justin+bieberPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/76324216898.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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