Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaf4e4267b2412a…

MALICIOUS

PDF

92.3 KB Created: 2021-06-15 13:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bbe56f09c87f7616d5a1f390dea460ca SHA-1: d6ba6e0f19f814c40007bbe7e713bd0b8a9e4d95 SHA-256: 3eaf4e4267b2412a60fb4b132410463a4c8b62461a8311671a88c850f69b71c1
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 https://medvor.ru/uplcv?utm_term=best+garrison+rise+of+kingdoms PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffad4524ce---litopojusugojogumilopipem.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607819b42e504---mijapubexogu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0mo5c0mmr29lrolhej24gsbpr0/titejifuvos.pdfIn PDF document text
    • http://azizolace.cz/images/file/72440681078.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/7642699984.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/262c42a0f58c27f6b3075d2da6ba20cc/rafit.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6a756dbfa2385fcf24ed0895e84c7314/tibejebaxupamukef.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210529203827.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086101227db5---mopub.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09dcb6f25---nipem.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/c458e03c006705ac611bea8bd4b04707/jerumujalejebekisagafonis.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e601bc136a9ba9b35dbfdce45418f7b5/15885606735.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b580e9aca---61214486929.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e889b7d4bfb5e36a523b87c65dfc8d46/7691372623.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/42187500252.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/18346600867.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c31e32c29a7d60b6d3e564d522320c1b/89741292006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 5056 bytes
SHA-256: 249fbf75809308bf55d2094b70b589909d3f94d8869453dc21dc2d209b9beeca
font_01_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 5308 bytes
SHA-256: 09d73a94f0f6bd6e815b6fc29f79235d786b5d4890c5fc451c210e53a2e121ab
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 11532 bytes
SHA-256: 5a7a43cd3f757fda547934007bb6c89eee42998861960d67af5cb0924e7e1617