Malicious PDF — malware analysis report

Static analysis result for SHA-256 504dd210e681cb48…

MALICIOUS

PDF

89.2 KB Created: 2021-07-05 03:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9efb6bb9a5c5592414a55f64cf75b130 SHA-1: b6b556327823b11c64659f223278f8603aadcece SHA-256: 504dd210e681cb48a9e8aea28fae28f2e8697c7a571aded1a52496a3dc4e362b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users to malicious sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nhs-carpediem.com/clients/46367/File/87459017450.pdf In PDF document text
    • https://widepolymers.com/userfiles/file/29829440227.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kepavetutobaxej.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/73534573104.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/8628582450.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4719b02acb---kojibefipagagubotifutapim.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/49775480441.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0842b312---liwupumoxig.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5c89527d---jivepakuwawixedovoboj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/427ju6f1jeom2ent4vf309q5v1/xusafelesawavoxobonodi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af9259a4f95---sijifuse.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/69000174546.pdfIn PDF document text
    • https://artenika.pl/fck/file/zevuwupi.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sejusupanemem.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3cdabbaf03349b8257e8fce80b057e50/wewigajimiwaduwavivu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/touivg52h6ossgd67rt2aabklt/tusot.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b270e488eae---mijiw.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cda6139fe---xubitezubatokikinilamaxud.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vclr8lkq7t854ju248je4j2hur/xujugekamavujukujaneto.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0bc25715---fafinikozipojuzuzibijaf.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b8e98a7a3c33f17c37c4cbfb6c06d63d/23974170173.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/76441666206.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/45650268312.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b052c82772d8c4eab6c2830a2034ac82/98577904086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=siva+name+meaningPDF 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_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10060 bytes
SHA-256: 916af5fd1d4ad0e864aea95f1ac998ceee3c98644b0aff2fa1776aa661d6a9c5
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 18632 bytes
SHA-256: 4b7a171a8be0a7a09a056228578bdcd8ea1c2f5e1a950d28e6acd182f1e1922d
font_02_sfnt_off00013fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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