Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffa7bf68d6c13e7…

MALICIOUS

PDF

104.9 KB Created: 2021-08-14 14:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b900b13db644dff78dfa9936e567b2c7 SHA-1: 410c89de41defe5b7c09b97ea703bd1796d7a757 SHA-256: 6ffa7bf68d6c13e7ee8d045d07b7ae12306f46bc260fd3c42d01833f43d7fe7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://newtech-utm.pl/userfiles/file/bupozidonitapunaroj.pdf In PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/witexuxonidelusulepub.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/74367107899.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b6vasrjqo7oeecosv7oh89f2m5/fananugijixukikoput.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160becf2a31f22---fepipubemow.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/26933487643.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/47d7d640727770581ef3385816cc6808/8118856562.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/98339651618.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/uqg0c2djf0j8hrhbafb6mkk5mr/gufafubanuwifota.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/rudufelafixesotalal.pdfIn PDF document text
    • https://proxus.nl/file/padatawefom.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ek3pcuq09reve266s35p2apgja/1690369451.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/suzatatavelifutikira.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d3571aae92db4f9ac83c586a62a2a7c5/lajezefofunebafuwafi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610643f7c3fc9---dugiwil.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210616163158_2117698567.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2bb64d83d9170db5c4c1efe387ce2777/10147745935.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdbc974cdf---42699289722.pdfIn PDF document text
    • http://www.celso.org/download/90970290639.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/gevuralasemoputezenasu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74d7ba626---54399207261.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/40582288217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=para+que+serve+levofloxacinoPDF 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_off000130ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AE 10644 bytes
SHA-256: b6a512836cfa61c7fc895eeaeaef00d10ec241278f403ae232f888e51354c1f4
font_01_sfnt_off00014932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14932 20920 bytes
SHA-256: 3c1cb89b51f61a577bda205aab442704cc662a7dcc78f84dca4ec3b7eb6eb4c3
font_02_sfnt_off00017be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1