Malicious PDF — malware analysis report

Static analysis result for SHA-256 3251f1ce20171c6c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 11:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a26f1cfd86862bacf002ba78469e930 SHA-1: 927fb211f76db64cd55a487a199ff48037bf2c83 SHA-256: 3251f1ce20171c6cf8f65d47ad0d3c6f4d696b52008925d74fb97e98f1d8b93a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=free+printable+5th+grade+science+vocabulary+worksheets PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160724f0e52425---66516295697.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef0215bb8---61395263651.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b32ce49e0---1184807104.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/jefasaxaw.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bd31e902---giwuvamegumebekadobo.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/vanes.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/26c5c8c4ae968c54138bac9965d1f66e/nuzomuwozimobozezamaxexes.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1947e20408---45551171293.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b312fa8b76ab409dedc998a34c20aa57/tunokoxoxogamovimaneto.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/gowazebivoze.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210623194618_aced1g.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf95bd8a767---44219216776.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/82471929461.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/76548577532.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf90ba30d---89747485810.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hhh7tc5d1hbjeb7oeaep4o2rd1/xajajasese.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jeboradexenuzodisogofosem.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126a11c15e4a---ripuzaviwomevetof.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f4e2dbcd---zudobiwamemif.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/rinofivijubupodowedibo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1f64bb56---latosonakekodur.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/16342494148.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/kusarivorafonorox.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/65136918185.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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 11504 bytes
SHA-256: 4693b9346cfc509113fea63fd596a39085f5140bf511504748b14c5ab1eb3146
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16584 bytes
SHA-256: b61be35729e63ef69f400cf8ce0a82f8effcc5706de8efc18f45cff9e015b717
font_02_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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