Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da7f9dbc41ccbfc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 23:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 976ec4e198e61846d3dc50c5d4c76097 SHA-1: bb9de4f9a97e7dcfbc143169c96374713e2aa439 SHA-256: 8da7f9dbc41ccbfc8df4bce316e055196f9fe13acf6adef0677d03266d81773f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af6114f9116eaba177439250bd74483f/kulokenatosukaxelo.pdf In PDF document text
    • https://manhalhealing.com/userfiles/file/83412003262.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/fufovizujuruderekunif.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/tafibirime.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/90508452874.pdfIn PDF document text
    • http://space-edge.com/upload/files/benifanexunevixavoliseki.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/57136946173.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/12433474111.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ce822de6---21773198094.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9fbe99a1---29386175123.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/29105957511.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/98952187679.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/92175199476.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/98991926911.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vekobunifexona.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/18736673249.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/nalava.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/kojuzuxawexirurozekalat.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/96186118774.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/38850344321.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/fuzomukenevowipomonejam.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161312c8de6392---vutojegevigivum.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137ede976a30---lebatajaji.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/jasisuzagazubizekisivipir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+football+stream+free+onlinePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/4486134041.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_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 17748 bytes
SHA-256: 416dd8323ed226344e83c5b58633b8d5014f5ede92602231088a8909955e62d7
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10732 bytes
SHA-256: 01d72d1886afe7f7cbc9454cab3391bf6aa55c77e9b47f0465622c3d183ffcbc
font_02_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1