Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac51f04828b148d7…

MALICIOUS

PDF

104.7 KB Created: 2021-07-02 11:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d0e55e54a302de722ee04ed90f7c0270 SHA-1: 48ae91f9600a00186f609031c692c4de4c110082 SHA-256: ac51f04828b148d777d2755a5c14b56de6d6fdc227bf4741b40f537d61e2d430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to external websites, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://laborke.ru/uplcv?utm_term=ny+enhanced+license+document+number PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/qjstl0mp86notos39042gcsads/dabatarufigabajuvimege.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6085f47d---13638619287.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/jawabetefuwemelakabopuget.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac5eeaf3d---tatumixomo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d42fc4e30ac---22585017730.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073724088da3---gedufezulatarur.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255ffdeb38---jufimevatejas.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fajosuk.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ohe4ga3o00trh6a597duvolei3/498691111.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bigipujoxileleki.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6d19c659---gomegasug.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/vikujusemisijedunuga.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/26112154530.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05e20fcba---30800278669.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/064ae5413dbf21d85353f32d6f8e4baa/joziximewamazezuja.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3015d3d577---gujigok.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/95086504547.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/telojarolu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cacc31736a2---diketile.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/sobeliresufub.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e1qcbslevmql0p0tsv50i0khrr/7655913749.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce273d5fcbc---kakizipa.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad30b7277---riziwekezufoxogiwukabitu.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/galuzajunanagipavoxerozim.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/vovinorizomubalugaz.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/busanitikadamulemusajego.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_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 10964 bytes
SHA-256: 5fe2ec771a2e1d04b653d2219251e08aeba5220f696263d0b13db9122e0189d1
font_01_sfnt_off00014df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF5 18140 bytes
SHA-256: 1f25a9682b2df72a5f8b2239c0210e71a4c83d1f99976f454467f9e21826abd6
font_02_sfnt_off00017d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1