Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fea60d670d437f…

MALICIOUS

PDF

82.6 KB Created: 2021-06-25 21:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6387cee43e8b3b616971e031acd65990 SHA-1: fe348116edbf21e07c458d41d4cff34f5ff1a8f9 SHA-256: e5fea60d670d437fae90b8d953be85ec310fdd5b6d3569fcb5ae6c4647192ba9
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests an attempt to obscure the true destination and potentially distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2ab55dac---tijerolojenetoderib.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/gaxitivafimijinesa.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/goxefibezo.pdf
    • https://acryl-bg.com/userfiles/file/masorujixopevokizagib.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783de73bb2e---98245096507.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac5fc18b5d---dowawalowa.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jm61k9ejpqriht5fckgs0o6bu6/wilumukefojarowupada.pdf
    • https://maturana.cl/upload/file/bejiso.pdf
    • http://yossy.biz/userfiles/file/81899202155.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q58oi5g2or9d4l62laiivjatq3/lirolalofer.pdf
    • https://atamergranit.com/userfiles/file/35603161190.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f80054f7c---panolexijuxevemilude.pdf
    • http://asbu.net/uploads/FCK_files/file/63592868059.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d2svsj45me90ceocqiockk9pc1/nijipatekamipez.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd3392e42---62442032058.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/73515936936.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/ae440118c0b5ffcf0fa400954ff85cfd/ninusuwojumomujug.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/73ea0bc113a592359143df97eb292458/kamelilezor.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607656b52b82d---sujumabijevuv.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160921ee751b3c---fakig.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/286f84dd90742af02fddd934fd793eda/gevevanini.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b472315a138---31799104355.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/009ha1179ocoatpef2ohd0l3f0/dimojepomifam.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc18c3c9cc---mazonudusuvolesubivixi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=african+cup+of+nations+qualifiers+table+standings
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/651f11d2e7738051a76aac8b9584299c/gasujuxirubavurit.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_off0000dcfb.bin
775a4008c7b19b804fc3bd296746e92b4901ffd0d5fae9ef6ea6ef89a429f76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 11164 bytes
font_01_sfnt_off0000f67c.bin
01aabc4c0631ff660f8c260d0175381495b3c250f7ccfc8d3410ebc007369c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 17788 bytes
font_02_sfnt_off000124b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes

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