Malicious PDF — malware analysis report

Static analysis result for SHA-256 c204d908b9683cde…

MALICIOUS

PDF

92.4 KB Created: 2021-08-09 17:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ac01c16a18e942ad68f50cea4a63d598 SHA-1: 92ec0b921f370298eddee9ce13c53bd983ce8654 SHA-256: c204d908b9683cde163aafaabe61bc50e0b619b5d06c62b78529ab33122fe405
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30493cb602---44509268441.pdf In PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/190627384.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/91519476658.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609e683fd3f91---bibekodurugivutu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9l2og2n0k56cikupktna1sc070/1341602350.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/45794169018.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/89143693150.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sadutedufezipapefuzagukul.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/nenadesexelaxuliwane.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/79885299966.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bijofoluzuzexamuzubof.pdfIn PDF document text
    • http://annabarons.lv/files/files/vedisu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/60408882322.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021751634577769.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/408bt8mthk84g13de0mot0h9ln/wigekotubizibilivob.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f1831471b21---wosobit.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a3e1d30b---gafuvowi.pdfIn PDF document text
    • https://bamor.org/userfiles/file/vuposenosidigopan.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/dokovozasilerubapava.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160722dd80a97f---jojazexixomom.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d0de6d975---juronakosuzukifetupa.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/54860291809.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee69cbbefe---kogibanoxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+determine+bimodal+distributionPDF link annotation
    • http://irodori.kir.jp/files/file/58187663801.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e9650d042982ee553457bf728d54ee25/mofopumupalizojuge.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_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 10724 bytes
SHA-256: f0b092bd25505124fb1591692905248150dd81efef3e8f542ccd8793c2d5b652
font_01_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 18288 bytes
SHA-256: a5530e47daae079a9b66328d77ce8868f786e33064f5bce5fe361f89bfd1fd0d
font_02_sfnt_off00014a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1