Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7df618a96271ef3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbb56bd3aa3c00177b67c249dd6d261d SHA-1: b391f8eab494dfa3083d2d16ec467690fb7c6f13 SHA-256: c7df618a96271ef33d6febb21a92c425c98259438d0545c59b31253928a7c579
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=family+members+worksheet+for+toddlers PDF link annotation
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/demefivogufoladofovef.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/dapumazajezor.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/27732494761.pdfIn PDF document text
    • http://nincity.de/inline/file/viduba.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/41372962613.pdfIn PDF document text
    • http://orenprom.com/img/account/file/mutenezik.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130e6f3c82ee---gakezov.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/63577925498.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xezufimaraled.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/54288450839.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613442e258a0e---sozegerunalisuv.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/27225430030.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/61962297681.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/solinel.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/deduxu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b4u3l6q2usfoa2ri0leps6c8bo/8159144963.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/pexape.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/safonosibomowogotaluz.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/vafapifimafuginibofame.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/50427708418.pdfIn PDF document text
    • http://holzbau-napetschnig.at/66100117394.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/bifetevowukasap.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/napetedetobapujabuxorivo.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/75294636689.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/4831620025.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/roxevigixizusafiki.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131139f8e4fb---guzobobokidojakuvu.pdfIn PDF document text
    • 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_off0000d682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD682 17360 bytes
SHA-256: c478ae42ba537fcbbd76df3366c07f1137d642eaf698eefd2a12f46c85363815
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 10924 bytes
SHA-256: 0955afbbcb837b61d5153fa56b02855dcbde8d55b9dc6c53f1572a3088ae64e7

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