Malicious PDF — malware analysis report

Static analysis result for SHA-256 1786ab5420f48e2b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 15:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5a0d0308601e3053e21545b65c3d922 SHA-1: e54010b23e2ef730c7ae0be82a72cc0125d6ace6 SHA-256: 1786ab5420f48e2b55b48fe60ea549e7a25bae15551548cd15d9d9c31b1df401
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=zombie+crusher+mod+apk PDF link annotation
    • http://ueros.fr/admin/ckfinder/userfiles/files/jasuxidaw.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/degarivazazeji.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210902050445.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/musefeloviwepufufenafunu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dewugux.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/genorudafuvifel.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414965d9f74---bovewekosijez.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401fecaa6e2---pigasugevenor.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6c02b5067be5595ff974a37118facfc0/95176676533.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84eceda33---nifixorug.pdfIn PDF document text
    • https://kimcert.com/E/file/fezuxipugetasazidab.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/15956466052.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/89697868775.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/mobenuga.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0851cc30c6ea0d19dff8c2a378090fb0/bubatikezafe.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/24022045319.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/kijekevivuvibenepitof.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/fagixidesanewakodoteri.pdfIn PDF document text
    • http://sissonne.hu/editor_up/47985231227.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1d529089---zujegakunajowazajet.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tetuxirijid.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mefenududerodajamalas.pdfIn PDF document text
    • http://telecycling.info/files/file/samofefopa.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/tarikutuw.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mosovugulul.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/64610002733.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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 17800 bytes
SHA-256: e6c3aaa4f626aedf48bf1a55757db4163f475b8d21bb4a96ffeb0271e2db14bb
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 10824 bytes
SHA-256: b402adc8d6da1f03639e16ace20fd7ef2a4f79d27c9a3782e771d4300ddf9975

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