Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e3aba4e3e0285…

MALICIOUS

PDF

87.3 KB Created: 2021-07-20 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0785802fe910c7dfa74860a6e129d4a SHA-1: 85e5ad43539fba11e15cc7fef9bb7df402e9d768 SHA-256: 3a5e3aba4e3e0285a6dc86b0ac5c212b38056cc04a640dcab7276783947e0604
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the attack pattern.

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7661cdb10dc477d2c5dec497870adb21/7655328078.pdf In PDF document text
    • http://megalabsrl.it/userfiles/files/85545181918.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/77229638745.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/sibumafiloxasogapabo.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/tosora.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bff01603e26---pivapoja.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/puriwafojozorawukupejonik.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c559b64b48---9555432671.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/88629096400.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb6781d3e---18071359101.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/moramunitisesa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919bb9c2f2d---wutidutawu.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/kokavubumofibekera.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/loxawojagumatajedekirili.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99f56672b---96197063535.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/24837502817.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0381730b---19479137486.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04512923d---xoroguxatorufomeje.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/dexojenotipoxuvowu.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/vovunofupamojuri.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811bbfbf83a---zigimekijofujuzuretifop.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5563c8aaa6092810bf97e00b19672b0e/68623651089.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vb4g9i3fih5qnv07nd45v17202/2171123523.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/978f7eb64d6c4c4d63388e7804c6a3d0/19706123954.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jilexibupij.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebefd10c37---6358269174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cat+tail+up+and+waggingPDF 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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10264 bytes
SHA-256: a59b64ccca6e1f54e7aefd5190e0129e51c1a1948a5942cc2fa74836aff5d485
font_01_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 17184 bytes
SHA-256: e23715ae6e59f04502232e58be7c13353462dca30432e961fa7617bf7a1ec344
font_02_sfnt_off000137f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1