Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eb27c3b635b8d4…

MALICIOUS

PDF

94.0 KB Created: 2021-07-12 17:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c015f9bbb760ddf8dcb8ff848b5fb78 SHA-1: f0d483dbab404b0b297d86c5275dc2ad3bb259aa SHA-256: f5eb27c3b635b8d48555ca754d1536b319a3618391d1816ba7096d3c60482f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=maria+mies+patriarchy+and+accumulation+on+a+world+scale+pdf
    • https://bmat.mn/uploads/ckfinder/files/48469689192.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/72daa0bdb8eff7f0dd5600e5928f058a/85673935466.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a56312c561e---83664529997.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9b772fcc5ee3062d2be8b09c47eeceef/nuviloxefepa.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd087148353d0a298888dc8c7cc046d7/80400654467.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728c2519c29---tofole.pdf
    • http://gallery4walls.com/upload/editer/file/30595316735.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/59118175009.pdf
    • http://kimhoatra.com/upload/fckimagesfile/44883644602.pdf
    • http://s-moonlight.com/CKEdit/upload/files/39951661092.pdf
    • http://angarakshaksecurity.com/userfiles/file/36626745078.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/93d99d79b7838bcc8b5c52ded9e7e0cd/3235716762.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c46bd580---tugapamoxusolami.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3aa7cad35---61287859147.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/7ef1c195d81d471737bafdff5c7db1ed/2544844989.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b246ee4ca---20595597283.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/819eefdb494c19628b3615ace163f901/lowosipipiwimuruwu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9e79313e---vadumujet.pdf
    • http://calebdobe.com/clients/875189/File/28391718178.pdf
    • https://alihuata.com/userfiles/file/lekofibetid.pdf
    • https://aartipalette.com/userfiles/file/fadedu.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb78a49db4---96099594637.pdf
    • https://airbays.com/userfiles/file/tidofepafolinemez.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/qcv086rkc5jdb9mm9g19apnpjb/ludoroxefutewivajika.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701c87a3cb7---rabine.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db28910987f---fuwikupamitibabekel.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_off00010631.bin
e9691e675a3e1dd90010064e936c2c48db17ddda2edaac0362f282d83d893fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 19244 bytes
font_01_sfnt_off0001360f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 16792 bytes
font_02_sfnt_off00014e26.bin
5348321f4319fc37c00eb145e4434facb5a59c0ec85a6d0fb3aa24615770c45b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E26 11176 bytes