Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b73e77fef5024c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 19:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccd723a0bdcff4cc311c16e6c6990bfb SHA-1: 8ac1eb6df8964523f0503c9d8cc451c181b4f878 SHA-256: f9b73e77fef5024c2cef09951fb36a1fcc630caeb7f619d94520d14e324acc27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=chain+rule+with+2+variables PDF link annotation
    • http://arredamentoambienti.it/img/file/50572379313.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430231416144997.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/99137347425.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/53715999687.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/tavakaxajogofepawe.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/ribila.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c52206624---jivikavenizu.pdfIn PDF document text
    • http://kaies.net/upfiles/file/kusidepozivujurodap.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zezukedo.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f0dc3c3f17ad6dc00d7ab5c04bd5ed59/37490088389.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tmrpsng3o5l2niigkmj7mne8m7/43984927249.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/72521248405.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/653c22103aef0040d51cd4ddf026d45e/zurilifemate.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/vetolekivusa.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ccbbd9387---mirewawunatabotexozarataf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc97c6d599---37322538824.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xajitewubutowexaxu.pdfIn PDF document text
    • http://ymmicro.com/files/files/59567628481.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2e766765e---49774641544.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b42f42cef08a137c29d2576603e81995/xozudosumibagivamujerana.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4caf607508---jodedimerewotariwimotado.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bd9054b8abbb0f1347f24aaba7881af3/zelares.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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 17268 bytes
SHA-256: 4c548d11ba1a2a94c5b9f7cbcbe8df2c71df92a93e3b735ef922d233b9e385dc
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 10628 bytes
SHA-256: 6b1caa56db31347572aefde7d30ed839d51e4c285c29c6bcda7130646b9a2f24

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