Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fad9764fc013ae…

MALICIOUS

PDF

81.4 KB Created: 2021-07-27 02:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0215abdcc04bf9b388486404e4d281c7 SHA-1: 7978fbc36b636a2a704a439db921cfef8963c575 SHA-256: c9fad9764fc013ae7da9038757e57a2b53ff8ea62004260317239433308309a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for initiating malicious actions. It also functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d44d3f084ca77802b9ad37c8ec89fadf/vepijafizaruj.pdf In PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/taxoros.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2af25a2d334a05b14b3d943b043df8c4/puzerugokijilodad.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/71870047249.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b59d22717---buduf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4013011193.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/10870e53f9762fcf6709cea4e9c37e2d/59996301790.pdfIn PDF document text
    • http://holzbau-napetschnig.at/89668920335.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092110adcdb0---23204922587.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/farazinojori.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q04lcv9a9l1qm8ojosjr62393s/lewativef.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/67787414158.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4ecc7d1b---91917357072.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/46939486084.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/joxuxijujomemabusekumuf.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/zisupukovilafonurokafa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe1c99f8c---vuxamurazetip.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9a79eb5a---tefenusubepebi.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/tizoxasekabozani.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc50abd519---55216129723.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/25fqbbogu5bmf5fhanqu1e97dc/gopamobanemi.pdfIn PDF document text
    • http://sbkf.org/files/files/63788608428.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160751906ae595---24558353145.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/jibefasapatitage.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/39f0d03d30cc2266d8f3f83be3809c45/xinune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ejercicios+de+comprension+lectora+para+quinto+de+primaria+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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 11032 bytes
SHA-256: 2bc91f36c5c5184efe73e9cc8a0d3369b91d12cd72aa06268425938b5904df91
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17864 bytes
SHA-256: acf987fa9831d3871c64ec0c16981da9e85c2377d17fc18fde9fc08fb9a2bf06
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1