Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f66b356f8e6d154…

MALICIOUS

PDF

85.1 KB Created: 2021-08-29 05:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58ece06ee4abd891fcae8d07cf4c9885 SHA-1: 0b6c39ba5f9e9b69c1cb0c5663d2d8085e4a398b SHA-256: 0f66b356f8e6d154d9cf64a7a4d7c53bbb91c11073d60e3e7eb508c53a74d3b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a download button lure further support this assessment, indicating the file is intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=what+antibiotics+treat+stomach+ulcers PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161178df199c85---36791139384.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210524032406_381920575.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/molemikibekibazof.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47eeff02db---lakezifejatifonosena.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161161db7d7565---pekoputepi.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/69316878884.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f12e69a95---17062561771.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/nigaluwogovisejur.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/felizawamebokopexumov.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160799d568debd---11443439572.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/66637024050.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/vatuxunajax.pdfIn PDF document text
    • http://technocom.pl/editor/file/27084512388.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/54432015770.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84797342417.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/varobawokovevubidivobori.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/64571245431.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/caa3c39ba42d6dcda7b0b6bd2a18c577/povixifarejixutizipuduv.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/15021210072.pdfIn PDF document text
    • http://volnynaklad.cz/data/file/rogunazunudofagosum.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f341b3cc1e1572988ceceddae11b4dd6/21089952266.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb3161f44---68823549520.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11f05f1b6f---sijope.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/46907293672.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160899f8d22643---41181477830.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/21403235169.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_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 10728 bytes
SHA-256: 393fe39e4820ad87fca9a18965d080e620d9a88b8f8eb81d1d7b5366e53ecc46
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 17440 bytes
SHA-256: e60dd72f6dc6e20c684a2935e00731a025e916027cba175909a2a1992fbbda03

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