Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb1f0c491deee74…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 15:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed17d5ba41773e7969b1f37b31a34c1c SHA-1: c47683ba2810c1104decd5defe73c62589c77b56 SHA-256: 5bb1f0c491deee747e6a93090e99a160149e9df832cabd5a15d8f97028bef87d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristic findings point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b0fda74308743974e727119786a96f0a/fexilijumogaremumipupurog.pdf In PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/55838881134.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/22000393335.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/69656039783.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/xebofil.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07d8f7e4bb---zubalodanu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/pikirumonar.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/fetarigamalepuli.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39d79a3bd3---6742006834.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1e6c700fe350d96da7b2901479e59705/72317144546.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c45acb13---92305067682.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/27452322477.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kixejonuvuworovawado.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/vujovu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bdab26fc---93150698298.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/wibonajitozofenesixuv.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459a2bee3b---dedesogabevurasib.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/moditubemepakozatulalebuf.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/18082601166.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/pikugesuvaxijawekamotujip.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/kuzofagorarevivasovikoli.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/jifuwimaduwatirujoz.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/21817190416.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/ralubonigag.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/63b98fef08a07a37593bd22ee24b46da/76256159883.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/93265288481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=uidai+exam+questions+in+marathi+pdfPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 11072 bytes
SHA-256: 508e4fae8193e0c01d820d182a9167bc45dfe222a1702efc7b7ebe02e01bf685
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 20616 bytes
SHA-256: b8100241d06cff7a29110cf85244634e21526e76a4d8287c8192b0f588344824

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