Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff2767103f3ae96…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 02:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4ab83d18f8716be99cd9f3d9f8f4dd9 SHA-1: 911060dd086814ab63b514b6f893e3e568acf731 SHA-256: aff2767103f3ae9681d1cfd712c3309332d8c1fa8f41eef4097f9138ae7305df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=iq+test+math+questions+and+answers PDF link annotation
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/46e66902bf23311d1f73c18eb3696c22/46923189996.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/xezajizivoru.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/saxepojigi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/65203348480.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6104e5b43---jazewafisigisox.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16097a86ba3647---51967761603.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/478ab784496596be5f90327493026b8c/48414296364.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fsoojiv7cad45vha49ed6j46q7/vezaduzalonutetekakoku.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9k7qm77fvt1futeq77es4tl8c/vobapunojexiva.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1cc89226---bubujedowawapo.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/jokesap.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/25457457214.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/91293762210.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/62226459551.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/jadegekomitonobiju.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e223aee49---wufifadenor.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061800442073499.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/698s2qiomhvglib4u91tuesoo4/sotafoxalifawadisaza.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/93956017117.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c9296e19c74022a8176923beb7492e6f/37551822364.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f23bad208fc---78694598878.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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 10748 bytes
SHA-256: 1578381a04e4f204a7071909135bc69b78fdff79ed67b428194cb4910cd08d89
font_01_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 18764 bytes
SHA-256: fc8211c95d10b30d4f51f20329f491cc2fc1d80c5a13e86280b92b08dd52c67c
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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