Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf17910b88d1c13…

MALICIOUS

PDF

82.1 KB Created: 2021-08-20 06:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dc9280d06087489a664978ec2a0b392 SHA-1: d19d4747c5ad60c7ce2c22845dcaac189d7c7cf2 SHA-256: ecf17910b88d1c13540c4ffe61f98933e947e464df40148b5d8a040c787082e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The use of compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/efeb989c96187ecefb8185a22054afb2/tokikaxekudedosapodepupe.pdf In PDF document text
    • https://nhachoxebus.com/upload/fck/file/57540925632.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9203f1535dd104bbf82a37e6c4271a91/kefujixusalijotelijipolod.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/botaviwu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a2167734---litusukapebovajen.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6411e123---13096739870.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/11473687406.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6413324c0---58467575568.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/titoselimoberunuteru.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a0625862097---jadijafuvid.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/37122676326.pdfIn PDF document text
    • http://velisend.ru/photos/file/rodadurimoziziriloz.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1627625706.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/96219574980.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608710ed09ab5---xepugowakumananikorajipiw.pdfIn PDF document text
    • http://e-sportis.com/images/upload/dufisag.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/ruwapixugoleramufisovarix.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/sigujokesilutaletijejop.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/32573202855.pdfIn PDF document text
    • http://favourtec.com/attachment/file/joxazesojuwazototu.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/gimisazoridiso.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/dasuviwilaxodakof.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/t9o8rk0bkus7cfivgosq90t5vc/boguwu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e8c78d0d9aea929a00359767d3fd71b/57521258629.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0h33k9a39329rn2iq4hnvrhqn4/vawavixatagiraxoro.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/44159667733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+do+income+and+expenditure+account+and+balance+sheetPDF 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 15908 bytes
SHA-256: 09c4a7c45c3c4a036c3b8866758541512eb7a415574ced23c3e3a0860e3272a7
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 11196 bytes
SHA-256: 6e4f606f4547f19cce9d57caec4bfbcb0befe144328cca9d2a4db8b57e2e07a2
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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