Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca959e596860a3e…

MALICIOUS

PDF

89.4 KB Created: 2021-08-18 14:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54bc062c140f2d9d707ce0f44e037f84 SHA-1: 2d5da6e1f4e36c86898f2ddf59717d5f8025dd5a SHA-256: 2ca959e596860a3ee93ed1c6ff3e4cf5af390bcf48b21168dd01afab1aa175aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=la+sabiduria+del+eneagrama+descargar+gratis+pdf PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9vf027eh9bg850f2791unkuv1/gurunegejidizu.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/simivilajavita.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/nukijonirilakevaw.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/widoxejalopuvebumovuzo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3028006950---wikusibok.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/66060c7ad34af72def6747e3c128983b/64270442747.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210619184328_z7dxwy.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/34922282961.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24210170919.pdfIn PDF document text
    • http://congluc.com/upload/files/24873735140.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b7fc1551---4773053091.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/46139415789.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/79996621509.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/98041263385.pdfIn PDF document text
    • http://islandpointfl.com/userimages/45318445128.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/4976529635.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/61067290222.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b041a2a9c0---5537518972.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/26386810742.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f228f000bf---70040180354.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/mixopesurerifo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4ac15db14b1d4e616d50de1c57b22c61/36062811739.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a036cf6011a---vopetubutesafefixikol.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/taraxewid.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/dipimor.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5c94a055---katifuvezew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 18152 bytes
SHA-256: dabb7c91ebb68ae7626cc95bbfd98652c355e81e4000edbd38019225d4314ef5
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 11040 bytes
SHA-256: 7a21b419190aa0b647c0e688f770d6b77daa5eccc3c7423f14ed2269611f0bf4
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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