Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a994762425a5cf2…

MALICIOUS

PDF

62.3 KB Created: 2021-09-14 08:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e53867aedaf3e2e3bfdb379ca54036c2 SHA-1: 3b9fbf4ec0541ae5a5790818617ed203ab55c405 SHA-256: 1a994762425a5cf28d83ce1a52ae8edb787c979452182260bca003796732f54f
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs suggest a lure related to software cracks, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

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://ancoraeducacion.com/images/kubinejerokunukapezewi.pdf In PDF document text
    • http://kingbikeonline.com/images/upload/File/8965318478.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359467ddd68---xevawog.pdfIn PDF document text
    • https://mediaskills.rs/files/kolajotodawoxoti.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/57cf638f6bec3e6bd90123c64cd1e484/63165789879.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/mutulelomexuxememujef.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/kufap.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/45379295633.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/78824060653.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/26118019886.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9418d2tnmf5pudi875hrtfniuh/zegutabutilizewawawoko.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/potar.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcd19b242---zipikikixo.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/ralezoxuvewoliwipakew.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/14ebf3abebfc4f947cd271333f36691c/9815836361.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/33497415484.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbd51e16f---55240407024.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sg52us2glhdq77e89dc4iua9ir/selagugukudep.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/vadubuzedizej.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/23388787385.pdfIn PDF document text
    • https://vpmemorial.net/images/file/nugigoxozaxudebumiwele.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/biroxavapinava.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/xadurenatod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=after+effects+cc+2021+crackPDF 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_off0000b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 14820 bytes
SHA-256: 14ad88a1b2c43f60d35cc21ee729f867206e41205f94fe69ba8c0c945d5c9b83
font_01_sfnt_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 10336 bytes
SHA-256: 92d09e4fb7d6b448e6307ee1cc6f526a8f0130679bae09f9cb0654f193c4f165

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