Malicious PDF — malware analysis report

Static analysis result for SHA-256 8814ac6e4db609bd…

MALICIOUS

PDF

97.9 KB Created: 2021-08-13 10:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26a714a51a0c15d2e53260633f03cecf SHA-1: 84d90d844ab0dfa95de0d1abacc67513b73d2cac SHA-256: 8814ac6e4db609bd4b51d4ad8d6d90c8bba670a1f10b24baed5e16b74436d612
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to PDF files hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://wwstationery.com/files/file/35060408048.pdf In PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/tajozanaxekiviresave.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/fejeliforameroxun.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076adecaf467---3253263447.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfd206720c---guxizojuvomibupiz.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/fabiweradepubez.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ffe24407---jibalabuponudevazabele.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/bb9c76712d923368dcd80d732558a3ce/51226469427.pdfIn PDF document text
    • http://dhf-china.com/d/files/75491619139.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/70412137365.pdfIn PDF document text
    • http://jfe.hk/userfiles/51987535563.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/takap.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/26631370487.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160851ef373ed2---xupub.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gekonisiwivikejukatenuro.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/56440410990.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/20013526917.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/gujuxaj.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/22daceeee40f8ccd3532e144e628af75/90790540852.pdfIn PDF document text
    • http://raczcsalad.hu/files/53739997991.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/77327224701.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gprt7ilgcl59c3ttkgc47a0cov/90493274454.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/42553919175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=exercices+fractions+d%C3%A9cimales+nombres+d%C3%A9cimaux+cm2PDF 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_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 19200 bytes
SHA-256: b0a4d946c766bdf2fdfc50e00f0eff1f8aaaf7f32b4a2c797d152fdd26fd7706
font_01_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 11236 bytes
SHA-256: eda1298e641d30c1420ab4486e1c50172dc5d4da0e25ab3fb811d8a8b6654fd3
font_02_sfnt_off00015fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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