Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf82eb38178c7c6…

MALICIOUS

PDF

104.4 KB Created: 2021-07-01 13:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f7d12b5531d10b66b50b931c1ac1208e SHA-1: 79b78a125b535aaac68ca4ca13da88e1fa8e3a92 SHA-256: dcf82eb38178c7c63748b9aa10af563dd85e744ec1af916cda62352b89f5f99d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=laugh+your+heart+out+quotes PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qme8vl09u2jrceih7ehl0adkeu/35616963375.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e04815277---ruwozalufumeboluge.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8hdl491nmf1mslaqq98v1so6qg/vijok.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wuxuwidigutoxukowus.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec4bd0b9e---puxepanabuxenogafugevukez.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cf5a64fe4f14a8a5d4fe64e471ce8aef/gogugezutigulow.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59184a2294---75706194621.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/87hgnft5v0vg808ggkdfbem9f0/86957388596.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/34683392882.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/29663705353.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210608062501332352jfse6.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kudokejijimosevoxojijuwe.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f8a161c9129dc3da82b007dd1f88b49f/26218417638.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/30914667354.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/12934284324.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47193a96b---54561525309.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd6ce4d96e---80858492445.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16079765b77f9e---falinozosujip.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/31145536865.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/xixila.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/93254717481.pdfIn 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://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_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 17896 bytes
SHA-256: b6a5b59904557ca1a1f5d58da10605332db47654905be742bd98e00ddac36204
font_01_sfnt_off000164da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF1 10464 bytes
SHA-256: 731c40c2ace95cd0b160da572c39a2497997ae9d9f56641410ce4c7bcac198f1

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