Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e25419874212e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-04 18:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dacc41a911d00482bfdb704780ee2591 SHA-1: d7f8f89d046cfc9b7cb5ea2e4698a71479e70a7f SHA-256: f52e25419874212eea34fc31a67de42d4de78479fbb3f8f051d588ccb0d1f2a5
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 disposable hosting or compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://dfh-consulting.com/userfiles/file/56792980624.pdf In PDF document text
    • http://churchtextile.com/userfiles/file/98479423373.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/56648188911.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/ratogamosibapexa.pdfIn PDF document text
    • https://dhesient.com/media/kenelu.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6a9eb37ef07be1a390ada90be16e2a2b/38008037911.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/36513435155.pdfIn PDF document text
    • https://beaszemin.com/files/62968025933.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/glgv0tjggvl43itsfcripf4so3/43943069206.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/bozeroxakobomorigexejaw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88cd16168---57794075410.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xawujotagikezamug.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffef15e3d7---1880145398.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/45426458237.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d446ca17b3fe2ae62c442f07d4c4ae17/65422155215.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2af7a6a8d5eeb8058d8b525103b4fa48/xenasabapepikozukadogel.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/hmo9c8e8bu6eripb7b44t8lvl4/sizafosobomik.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/si2f8ulqqahf1ghr5tv7r8iufe/monixi.pdfIn PDF document text
    • http://wamer.org/userfiles/file/43636991462.pdfIn PDF document text
    • http://rilta.net/userfiles/files/pepopakimofora.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ef212b00---96372682348.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/lozitegutanun.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/00e8914ce2470c9e8cf75f2d48ba41da/74691217256.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/96735194316.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/38106617614268c5b3278d563d6d14a6/newukuxepumufamuw.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077db71ecba2---vegunejagomuzitozon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=divertikulitis+adalah+pdfPDF 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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 15928 bytes
SHA-256: 3c7d843e920ad904482b3bf4585914f705c188d06f69c9ea70f3fd4c9ce57cad
font_02_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 10628 bytes
SHA-256: 0d28b8beeb74b659f172dd922416079e57bbfb230030209f29d91a66bccbbb61