Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee9bdbdff1e9ac2…

MALICIOUS

PDF

189.1 KB Created: 2021-06-30 13:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a2828aa1fcb9a0def957641e03dec30a SHA-1: 0b5dc2cbb5f2e4ed6cb78f2262264d7cda1171ae SHA-256: dee9bdbdff1e9ac2d697d82458e8671c4d033cc1a7e3f973e4756313851f1aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of a link farm on compromised infrastructure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7dcf7eb1c8f7d4bdfe8b756360d47e5f/wukifudilu.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e50db39732b631845f8f45c0ee32c646/lipuwojejulunebuxunotuki.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cedc8c644d---pawiwarasapeledarimi.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/46986907659.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2eb863c58.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/xokukazolenigesopiton.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f0428853---20434098587.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a3dcb1a4---43051123538.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/hlqbuer2kvohnkc4gq2v0mecji/92075188037.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cqlm5k9bovekjc6i0tobn01b90/xufitufomilajada.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/8289479252.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8f509083f2338a464a6f1bbdcb726b50/mudafikawi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f41a652009401e64e7c4bcb194765c5e/26252027141.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e6252a4a---27601060289.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sobolafemusakivusede.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/87478064413.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d242a8ba8179c38f397d3d17cf7c60b2/37024706808.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/51407604920.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cee97fc58---lajiva.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/60767529594.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607504402f482---vexolamebijisavug.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nokuvigevazoweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=goitre+meaning+in+gujaratiPDF 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_off00027ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CA2 10508 bytes
SHA-256: 50f947151116d506f18eccfb7a1f1dfccc124b617fddcb5b633990f481046d37
font_01_sfnt_off00029487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29487 22304 bytes
SHA-256: c3b30cfee4e7722203e813aedb13e088acee5189dda357b4b6c33f901279d089
font_02_sfnt_off0002cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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