Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a42fc49b4f8d1c8…

MALICIOUS

PDF

63.8 KB Created: 2021-06-06 17:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e0da0ccb2dfc1bb08c725023bed0999 SHA-1: 1ab0f595d6710a48f63619f6ccdbad697dd59fd6 SHA-256: 9a42fc49b4f8d1c898695ff71244ea262e57cc6ab75b4efd36bcf422ebcd77d7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=informal+letter+asking+for+advice+example
    • http://kolasinprevoz.rs/slike/files/77781355507.pdf
    • http://brandnewgoods.net/userfiles/file/4077858697.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5738aef2e7a30729767881e972bf5f82/8438735120.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac941b1d74---fubodapupumalenezulukol.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/18930bf62e386765a4387b0da65e312a/25706518021.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754690b5c1f---melonexasowopiwujado.pdf
    • http://evpltravel.com/xv_image/file/51551306250.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e25b7e4dea---83595889056.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/delet6vdg21qf4cjetkheupkf7/10781925637.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfa77c79b---17926669511.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a387934a38c---wikanuzigubajawekigekuno.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ffc985ecb2cbedfc56ca91a361603a61/vemesevuva.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e153e4918---bixoravuwigamozureb.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608871563830c---vijurakalazufekexukukipaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19d.bin
2458177c8e4d65eba5c3b8bb9aa06846654571c2d8fa2c4e6f4f9a6bae78357d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 5604 bytes

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