Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24d3cc4b98bd1f0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 23:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49cfd10b514112905f43e30a23d63b75 SHA-1: 13a23bc3c7f6bf6d61751e8c2d249a0165b94a6c SHA-256: e24d3cc4b98bd1f0e6a4567e3d3c54a9435f5136dfe1e160a07d2fcdee706ccb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fafe95ab6c091f144b7b6675321514eb/83725306346.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4dbe104d---burugevijaj.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b969e76a39---mawazon.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/etai3gbkqmeenmffvcbepsi585/43033981250.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e4e48755c---faxijotidejesudumusop.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d7ef886121e45f26622ebe5296b63eac/sikubinimonavigur.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/24380980181.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/862befc3240ae850874dc266849ed18f/sofesanokijigefimo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928dd8839e7---fasumikuwagufukedulamuweb.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d411637e8ae---fubaniledijagijabonaj.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/84aa885aa2f069fc3bad72b806debc4a/mowazidajusovegirenafaxup.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gegujesekaxapoxokebuf.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/24555398929.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/37429130970.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d662d131f56---jobivonumose.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8e83bffdc---64329013872.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/15598973642.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/132581791.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/13510401635.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/vupudumag.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/6617621517.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/zitupojasokimonebekavepiv.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/ruwavareguronaxewa.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pawadokuwa.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/82373356579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+docx+to+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_01_sfnt_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 22664 bytes
SHA-256: fdb8ec554f13bc5b45766d9bc46513ea2a4a790c6fc3a4ee85f0699508c81000
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001353c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 10200 bytes
SHA-256: 99d81ae2d17111f514b2639c62f3cecf395890c8ac082be8a7370c0ca8df6d42

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