Malicious PDF — malware analysis report

Static analysis result for SHA-256 7271d6cc3d76fa87…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 09:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17907c4784894abb23e435e699c94957 SHA-1: 162236e247c6b0b40e177365a0a8150f567e7fbd SHA-256: 7271d6cc3d76fa87faf51ffdf85378c05b3ef436e973e8d13440074eaa7c5f2e
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of 'cmdj0/lefezovuwew.pdf' in the document text indicates potential command execution or exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v6lkfeje59k9fdjfo9sqs4ddn9/67571397880.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/67387789b6b3bd7621309310d28e6325/mevoxefekelafekuxezovam.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b78818d256f---4157916163.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091792cc9d43---tepudugalafekobinikireku.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/35584449300.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff2bec598---xujulugomak.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/fmum8oog0ahibu1sk5hnlcmdj0/lefezovuwew.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/75052473513.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/gerogetisepugiwuxazutaza.pdfIn macro / runtime command snippet
    • https://braindevelopmentmaps.org/userfiles/files/18394195356.pdfIn macro / runtime command snippet
    • http://cambresisemploi.fr/ckfinder/userfiles/files/55203859097.pdfIn PDF document text
    • http://planbmedia.hufiles/85178951892.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cae1505efe0d3f0143eb1e89c218e824/sobotijuliladomatabufe.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/fopofujofuvaw.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/18490152827.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/b160f097489acc8471cbf5f54ff3b036/2815198267.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/rasoxakires.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/milafirapar.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7126db4e7384291381f7956e3835c25b/zarulumidifigotu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5cbb9bc6e27b1f97c7a63ed92ece587d/mebokogit.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/18917185807.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3c1892ea625a28c726fe5847cb43b586/9937020184.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c684308909---walovipomapuvefowuli.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/boxavawiger.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwoIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=real+monster+titsPDF 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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 10312 bytes
SHA-256: 4d8aa9fc5a45354c5f190e4a21f84af214c59ff7814f728d3b739d47c8ce4e25
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 18064 bytes
SHA-256: 0e8e19e2f77efdc977774e97e8a9b79d49b443f8d9d74d9ec7028498b8184954

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