Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c27f82ed7ce99d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 15:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3e6a63f9591748258c79cfe1bdd01cda SHA-1: d4d8a3b4984630ea77547cc7e13f4b8831363252 SHA-256: 18c27f82ed7ce99df7ecdab2e469867fecb5d8a877f539ca6f3e5c2606cfd7ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to websites that appear to be compromised CMS upload directories. Heuristics indicate this is a link farm, likely intended to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to lure users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/rh9v70f4hlgad01tp66mq4jf4l/xavofofexomagaso.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce93dbd23b---pedajobebofadogam.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/kadetarewanovevagarekova.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c0f6aeae---zajulasodoxotisegem.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/memolugajapimujud.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde0787a31---dogipagax.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/zobalorim.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/v63511eln1ue7k17k0vsb3f6gi/62829511892.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/22496782813.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f90606a282---bobusubi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/coq4dk5sfbcgdc5pcq2gh35ncf/mufotivugonodovenolejep.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xututeziro.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2f86ccd98d9513fcabfaa5a48d883256/suwoxuruguxalenojefibirud.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c588ee0d---zubexadusesoziji.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609636c078110---32104724722.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877c9758f1c---46487591044.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/zufarisuva.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/sotexuwan.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/rimenejopunapumepiberopor.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d06ebd603---84728543535.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607589dc79f85---17035874933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=blood+after+sex+femalePDF 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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 17160 bytes
SHA-256: 3abd90f8fddd90f13cf9c9bf440ea419e7a685f4f72ed41ff8f25f1ffc5736c4
font_01_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 10476 bytes
SHA-256: 883c8c840c5879e72d1a2fefe7cf3bf5f841b697e120393f5f94b19188e58612

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