Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c249d27c1353603…

MALICIOUS

PDF

101.9 KB Created: 2021-08-05 19:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff2da01ceeedbeed7f83a42e6f9e15d8 SHA-1: 85dfa9e767e824787b694875cde06e97ffaa27bd SHA-256: 3c249d27c1353603bd464c1365d12248e8df259c379e9e5d0b8747a4d9b9d042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm designed to direct users to multiple external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised CMS upload storage further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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
  • 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 http://ctkupavna.ru/upload/file/42451709474.pdf In PDF document text
    • http://hainfelderteich.at/69020138335.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/xotuxokisoditufil.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/11666504485.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eacbf8ba---jaxilotafalasizaku.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d316a573---nonunogisokizapegutaf.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/bewenokokaviwowadukekaxu.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/zuzagaxezixonalekero.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/luresavidogebeviv.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tuwofirikilemisep.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/buridejerawilexamivivepeg.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21740167106.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/70864079559.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dl3682tjk8drqale5ubfv751b6/fotuvategawag.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/21166495462.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/fedijotalewozave.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160925ff480e5b---63978812496.pdfIn PDF document text
    • https://blv.by/upload/editor/files/21558637012.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/telakodi.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/62103264882.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884fc419355---vewivolimadomeninuta.pdfIn PDF document text
    • https://paradigma.bg/uf/file/dawegirugoladudimef.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0f8a9d5ed6215e3d69c9d83d99a3d58e/96754320431.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/83768172174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=el+peque%C3%B1o+nicol%C3%A1s+resumen+por+cap%C3%ADtulosPDF 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_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 19644 bytes
SHA-256: 6747a867978890c88feae717a6d2e7abb26d47e41a2f7529d4e046e96d67e7a1
font_01_sfnt_off00015565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15565 11212 bytes
SHA-256: 7d95790c1ecf3e4dd9bfeaf79e6ec54ad306773aae5496af13b091a6441c9aa6
font_02_sfnt_off00016ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1