Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e50e3a8d4fd8c69…

MALICIOUS

PDF

84.8 KB Created: 2021-08-29 17:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16e557c9ede3063e2e446fb5b1985576 SHA-1: a5aed20c0e3f1f186fd9cb5f8784d9ee64d457ca SHA-256: 5e50e3a8d4fd8c6958e027ee8ce5459b15bddf71070c37468d59b9a3a81ad5c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=reaction+of+sulphuric+acid+and+sodium+hydroxide PDF link annotation
    • http://3xlove.com/uploadfile/file/90294423946.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/54449043834.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/monozanezorakararonorinaj.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/21743275391.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/6215196893.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/46bmpvoe8vdfr4hjuk055ce05f/zobetuwedojida.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/favalamuvujitotuvovom.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/7883724591.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/13386209803.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/doi0v3uljs97hom4ogp6qnvcuj/fokovevolufi.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/60727033739.pdfIn PDF document text
    • http://packamate.com/userfiles/radagiruzudeboxo.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/romabuzufuvagimen.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/luwamarusekola.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ncsv7i75nd44k0l8qbbbrrn9n6/21522261792.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d2469f44af77400776317fefb0a81ea6/vodagimelofebiparejal.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/wozowejapumadewoxit.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708824aa30b---dawob.pdfIn PDF document text
    • https://bursac.net/userfiles/file/55595084224.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/manikuruze.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37e791911---wafolomobafifuforame.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/36607402595.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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 20552 bytes
SHA-256: 76025a43e36031b3066bbee9dec627464f6de6ca068972ab033f387985a2d7e6
font_01_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A3 11244 bytes
SHA-256: a0c3fd1043d3894b4e8d5953ea6bac5ba3f3d8419cba3ca45d17d81c44c61543

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