Malicious PDF — malware analysis report

Static analysis result for SHA-256 249e20e58c8745b6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 03:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae5adca5045b307e7fe940b64ac8c262 SHA-1: ed145b68ea3ab5f27104a4c11e0cc2fa91b5a77e SHA-256: 249e20e58c8745b619bfd9d86dd9f6b43689e35fe67bcc4fe73c2ff8eca4dc89
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' in some URLs indicates tracking for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=private+album+in+redmi+note+9+pro PDF link annotation
    • http://mtjjt.com/2013/upload/article/files/210919110205779662h3zcz.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/maruxilaloxujaxowadofip.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/gogisokov.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d005425f97---siwararupuw.pdfIn PDF document text
    • http://www.andreapondika.cz/file/48493640911.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/57567836635.pdfIn PDF document text
    • https://aneri12.cz/res/file/83141803357.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/vivurunodel.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/93nmfm3f0hlb08bctfqjltj45q/wizojelibud.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/89195101384.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb5760ad8---2384797175.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/65943506085.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210913185825_grmsal.pdfIn PDF document text
    • http://inphilong.com/upload/files/sokepufabajos.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/wipikizutazesisiliro.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/45885430923.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/26083763174.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rawuxelebavuseg.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/50506761251.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/xovamojomuk.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/87532499878.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/repufanajagedebuzilipi.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/sifexafegiz.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631455237.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/ruputazegegeram.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/27884532914.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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 18048 bytes
SHA-256: 0f623157a7156b13de7a641cebbf3bf3f31e2de084559f77050daa023b051431
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10860 bytes
SHA-256: 1f482666de05bc257c2a257bbcddc6b2707f2ad18f2a4228f106810db59db82a
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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