Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf086d198738616…

MALICIOUS

PDF

92.1 KB Created: 2021-08-01 05:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25d9f37cc49961bfc071be506c73c203 SHA-1: 18025734d6f08a11e6b326cfb8fd621d32fcfbfd SHA-256: 9bf086d198738616fa43942416f4537c22a7acc1be4b1901c550a1f3412a6f5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dtd.com.pk/ckfinder/userfiles/files/12084501736.pdf In PDF document text
    • http://carnow.jp/js/upload/files/14764560154.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23aacbe5d---zegexitirogawefemexatevev.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/sozesarekiparosetalo.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/badokexisupupaxipavu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/56065435961.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/salur.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b828039504f---47907820974.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/23419774593.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2ppgu4v3b1diq9eun529tbpjng/99041069530.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/081f1db5e68a950f7856b23356c867fc/48860082319.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f04b7889621---foretobuwutonagarav.pdfIn PDF document text
    • http://askort.pl/Upload/file/74725935753.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d21104196cfc44e5b9b83cd95f1c9735/tovakegizebimimozidego.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab93c084c---52045135033.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/21178466432.pdfIn PDF document text
    • https://nada70.org/userfiles/file/2104333750.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zudatovolupinarigofip.pdfIn PDF document text
    • http://merwepizza.com/upload/file/lujogarelujizizuwijuf.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/zuvipivoles.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8b370fc92477fae0c7b8a77f1845f8f2/64071294924.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/13166502521.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/4304103020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=libro+la+noche+oscura+del+alma+thomas+moore+pdf+gratisPDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 19652 bytes
SHA-256: d8b1d13ba65b85b293fa3d63feaa8c3bcf1b49c4f7a2a555476fda8bddb5bceb
font_01_sfnt_off00012ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA2 11264 bytes
SHA-256: 2881abca55c68ae6fcbbc0657b11938e6bacb365f9a1c27d31755619f1c3a26c
font_02_sfnt_off0001486b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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