Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebb780a5edc4403…

MALICIOUS

PDF

89.8 KB Created: 2021-09-01 22:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 277bbd037e456e05b7d22e4705a43e41 SHA-1: 454aa239fe6b99f8f527d9855a5e94e3fba03e6e SHA-256: 9ebb780a5edc44034d6f416ebe87dbf65c2886ac1209f7682405485f37d8f640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI links and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=english+to+scouse
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c89042595---82107842514.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h0n2e16l2b92dl3qrsuallvdpu/83881591964.pdf
    • http://beiwendq.com/userfiles/file/6449549760.pdf
    • https://liniagdanskzydowo.pl/files/51559588337.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/005be8905d5a5d817c9e26692de3dd9a/sigarenisexetotubedodimuv.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160859eb23449e---2485224009.pdf
    • https://oxi-dental.ro/imagini_ws/zaxogafejunawofididutori.pdf
    • http://holidayinntorino.com/userfiles/files/28195492175.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f02a15e2209939cf340ab76df5235712/rolipumenixebidajuziremu.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jusazelinekukik.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082189a01c97---62837031839.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ig37ce9ot0r7hrgc70diqq5o37/22264966315.pdf
    • http://xaydunghoangthanh.com/img_duhoc/files/87227889062.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/26857749671.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e2f2c2ab4---30022193749.pdf
    • http://bogelaipigeon.com/upload/file/59153315161.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2e1tpoqrkdb9fmif75gmfera68/23594978542.pdf
    • https://adepotcustom.com/UploadFiles/file/20210517065003139.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/siburale.pdf
    • https://behbehaniprojects.com/uploads/files/damidajewebozopotutu.pdf
    • https://luatsubienhoa.com/upload/ck/files/mawigoj.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec898f7db---91721976201.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7b2bd4d5---64401119023.pdf
    • http://brandiassociati.it/userfiles/file/85268559165.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f189.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 16792 bytes
font_01_sfnt_off0001099b.bin
1b52c1d6c76151fdc47665c95343f108b1e43d0663f108db89a3db375003d861
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 21916 bytes
font_02_sfnt_off0001427e.bin
9c77dd4e9363cc1112bb2785b558b388b0524779fa02adab28ab7208ddd2a304
pdf-font-stream PDF embedded font (sfnt) at offset 0x1427E 10332 bytes