Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbff3a497fea96ac…

MALICIOUS

PDF

84.9 KB Created: 2021-10-05 17:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67fca3a82908981d1a6be40a1a26d857 SHA-1: 513e36762dd65c29858d6d8d552773cd75eeab5b SHA-256: dbff3a497fea96ac45e3e1869b9dd559f9eab1a222b44bed6f55157440ac0ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=protection+from+the+enemy+scripture
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445e4c433e5---zitisulen.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d06ce785b4---rarudejeguguva.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/eb31f19315642bafd1ab099934406708/50937291376.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8ab29a0fa9adf2ab09ce4f0af6bc2f5/sumuzedixem.pdf
    • http://qazaqbanki.kz/data/content/files/jakimuzajilotepagepamefiz.pdf
    • http://chinajnbt.com/images/upload/File/begenodi.pdf
    • https://yaslibakicisi.net/userfiles/file/70272562468.pdf
    • http://polesprogettazioni.com/userfiles/files/wojosufage.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/33646097244.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73de227ed59ca95d3dbda0efd02695a9/bezuzovamogofubuvumaxe.pdf
    • https://maryamghiasi.com/images/upload/files/97117898783.pdf
    • http://abwcoliseum.com/uploads/files/tuvor.pdf
    • https://i-intelli.com/ckfinder/userfiles/files/17541979502.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/fotizewanubapubebosise.pdf
    • http://geo-equipe.it/userfiles/files/jurom.pdf
    • https://namkhoasaigon.vn/web/images/files/zerobedefew.pdf
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43721561957.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/zijufetuwofit.pdf
    • https://aeternoplanning.com/ckfinder/userfiles/files/64824121408.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/netirogariza.pdf
    • http://columb-sklep.pl/userfiles/file/xanaburejovaliji.pdf
    • https://thietbigas.net/media/files/tazavepukimivisoruxakamir.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/94032825655.pdf
    • http://magooferta.pl/uploads/fck/file/rovugizoto.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 16792 bytes
font_01_sfnt_off0000fab3.bin
4fe4e55c236cc6762dc5c4447ac3d37d3ee087fa9aea748ae5e1a5c680c057dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 10752 bytes
font_02_sfnt_off00011347.bin
047e1f77910e86d10cc13a628e00ed48cde33a8f220801aaf6c023026290be6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 19864 bytes