Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c12cd1d47ae77d0…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 10:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 588b5fd001deecf970d7b21629073be1 SHA-1: db94a94c88365e0ade1cb729a7567a97620c03fa SHA-256: 5c12cd1d47ae77d0a4f436390d024dc81e6648ad0d2550b6045901864bdeaf9d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many 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 multiple links on potentially compromised infrastructure supports the classification as a malicious link farm.

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 http://elitaliaweb.it/upload/file/76320882610.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/t6rur57jrkg72ug938vjrtegq8/3445810087.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a678535f14a---terisojetomuvipaxaxo.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/vojutawo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/20063296120.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/64163681356.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160712d97c3eb3---45231660830.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1b83f39c3be6623f8d6b21b4fdc1b9a3/junupusap.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775c3b29db9---menuv.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/26318710526.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/tomanizidoredulaf.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/piwovovalonarotupolaso.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/kazufabemefit.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/fogunosut.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/89190604536.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/tplo2867n25dgmtj85f7dui20t/7342006041.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e54e8058---jokigilar.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9e7f1dff8b9a893ac084530a9217ec0d/vakudif.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa79999e2a1---66695568815.pdfIn PDF document text
    • https://ahha.az/userfiles/file/tetewewuje.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608da159b6671---gunakomemizekunetotikoz.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f93686bd9---wodezilivif.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/mizololijemivabarunobitux.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2dbsb4p926b3q7js79pe897v52/22758016715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+are+the+key+features+of+researchPDF 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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 17304 bytes
SHA-256: 5da12192e0be76d28b008aef404726531100672658c7ed038b0b7e880d137e9b
font_01_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10488 bytes
SHA-256: 4f74af0385879965cb617855755cc37e579270889c381a1e7ec256012a1c4d38
font_02_sfnt_off00012a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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