Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce30384d46254ac7…

MALICIOUS

PDF

76.4 KB Created: 2021-06-30 21:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 734c84b1a1358ee5034f318ab711064a SHA-1: ad700ff0ddf3a1c1de8e40a13a264cfe7121e10e SHA-256: ce30384d46254ac79b4a7e4702a9a145bd30e7a7d3f8cc1eb7ee2640e1c46031
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external URLs suggests an attempt to redirect the user to potentially malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/tsf51q1tj4b4e1vh4ok9ogturc/27482757767.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///34248152877.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78189df473---solilerabopenixukeweju.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2348e6f254274a54e2f0ae5b3db377b9/50172785501.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/pokutenunivifirabisagoru.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b490b336b2---74348599804.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/68520832849.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/tofilunuxud.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4d8b0a45---xazesafalewinubivinitep.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098a716de1a7---64942198749.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c59e537c8c9---23402412836.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/fogotefuxesebigeritari.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/monizutamenabije.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/65763618275.pdfIn PDF document text
    • http://chikatere.com/Upload/files/sukaseretivuvol.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kgik87q1q8m9qc6ujarlvtco4g/zaxuzatikujumupafek.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/65656562894.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/33647950724.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/towuvule.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/26677792498.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/taborezevap.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa55d10f23---wudebevokux.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd41f0a437---30030674636.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/gipanape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+aftermath+2019+movie+watch+onlinePDF link annotation
    • 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_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 16620 bytes
SHA-256: 0db5764f4cc77be97ef377a2d311b6f6c2a34f42ab65890f210f83abd91687d6
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 11008 bytes
SHA-256: d3bdc7f32808f47353a7dc78bbbd8778914ac3fd57890ae49dc0471c95fce258
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1