Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc388a3bc951336f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 21:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32d654c1de84b0fad445b607513670df SHA-1: 8cf11f39694ad948cfef40722c1630cf11ddea2e SHA-256: bc388a3bc951336f209040878e5b62cb11367a54b9d43f169a3e2958ac30e4c3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, several of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://21cedu.com/pds/userfiles/files/nopovekir.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/rosetavedenozob.pdfIn PDF document text
    • http://rentaruedas.com/files/others/karonupafeg.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16322057358602.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/30696716948.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2855468aad7cbc8bcf30899717da9259/60800047729.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/58968eae35d7f238c69a48320cb4d696/28742988652.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/kefemiturutomeso.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0239fbd7---48650487035.pdfIn PDF document text
    • https://bem-sa.com/img/file/80416547740.pdfIn PDF document text
    • http://yepuco.com/uploads/files/saxidolawapalilazategu.pdfIn PDF document text
    • https://fultoys.com/userfiles/11467224034.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c261bd15f---72112659764.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dofavipatavu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b13248ab4---luxiwi.pdfIn PDF document text
    • https://curvy.tw/upload/files/80366809141.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/gevisilozarumemexuke.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/zozamafobugi.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/sozabi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b6757ba---rojexetezixatorelefodat.pdfIn PDF document text
    • https://costarica4d.com/contents/files/wibatimutituveguvob.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/84232204817.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/warekapuvinewezoboripan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gone+in+the+night+full+movie+onlinePDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 14468 bytes
SHA-256: 18eebfd5acdd45f11566725c45a0e9259c5c36b8ba2350f2954d110331ae013f
font_02_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 10436 bytes
SHA-256: bb2353aa5f52de0c5e8734fa5c45b508c8c96448a89960f809e1b0b63628ff26

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