Malicious PDF — malware analysis report

Static analysis result for SHA-256 e818e39820642e65…

MALICIOUS

PDF

74.1 KB Created: 2021-06-20 03:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 845fdfe9dfe3c78688612ec7aa9dba17 SHA-1: 7902eefbe0045b11d0af239f6a49f22f03947a21 SHA-256: e818e39820642e65cb23d770ee77fcaa7821c11e16357e0eeb8251a492f81f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f889e46043---lirefedojorimosobot.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16079c59137a57---bumuzulegupe.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/19337972574.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160896ca683c26---4173839534.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c9ab6671---25193410718.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o40uct5c8f4qlkobope93e6c5v/fodelipulizor.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/lodaruxepoxulezoxad.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a2c9a9dd---52214981193.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/dalazeg.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/aae1a1377dc218609da512a6f063f3c0/71646603084.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210617224214.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/lirugujogibes.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b547a307cf0---bufev.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5edba7e08---66037573417.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dde1ab3e4272726f379bba9b980f571c/bejejulexixoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vision+and+mission+of+teacherPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 4984 bytes
SHA-256: 83a51660e9772509ae98553fcf5023c68095dfe6955c87685d8d3459a3cc3da7
font_01_sfnt_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10364 bytes
SHA-256: ffe83606e9496346548a83bc244f1dc23ca0b8df31ce7c32770c8c21bf116b93
font_02_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3