Malicious PDF — malware analysis report

Static analysis result for SHA-256 6663b57a036f7d95…

MALICIOUS

PDF

74.1 KB Created: 2021-08-14 09:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aabc688a0b2f353c865029cd5beac15b SHA-1: 4e91690a04c6d787e11f4d8bbb8da34454861345 SHA-256: 6663b57a036f7d950a7b6d3629f5777356f26d8c8c313d7ac3f8fc924a5a73a7
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with specific rules indicating the use of compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs, while numerous, primarily serve to redirect users, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9531

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://hanmarklight.com/UploadFile/files/puzuvarit.pdf In PDF document text
    • http://blackivy.pl/userfiles/file/90720403021.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9f487be4---77303762711.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/goxewerefexenimimufeso.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/mavaxutitafowosinepapiwux.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/85842987754.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/lapedowirado.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/54135780347.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/8cd7d3ae09c00ec33dc2eadb898e8d6a/denuvujurefutiduv.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/53415696175.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/23229763468.pdfIn PDF document text
    • https://landi-bg.com/images/file/30425761102.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/34285460401.pdfIn PDF document text
    • http://drironcat.com/images/file/zozez.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/fusutidetujizi.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lilelotarosubepexenaxogi.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/demumilulolesuzejufa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b16106565c2647efb10aed2eec22ba23/joxanofuwokugora.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/nuruzukerakuxesunebusilal.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161154569c7679---wixib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=diggy%27s+adventure+cheats+deutschPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 10800 bytes
SHA-256: 88cc6acc870b362a123db1c04c67326155585b1c7ce556960271600a7dee5b2d

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