Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef3932f323816dd…

MALICIOUS

PDF

80.8 KB Created: 2021-08-21 20:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc237541ec15fbd68be224bf01e044a2 SHA-1: e6044c8b2528d92ab90bde845d2c62878b3743a1 SHA-256: 0ef3932f323816ddb5d993d9c5a7179c997a55e919525207b6e4ae39dc8981e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_URI heuristic indicate an attempt to redirect the user to malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=bbg+workout+program+pdf PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60aa8095cc---90831386377.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5308e3926---pifujaje.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825673a9146---37078625475.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/82091983484.pdfIn PDF document text
    • http://ihdbd.org/upload/files/dimugetedumoji.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b95eb15ae8a74398f023da7b32f1a0a9/xutelafajekijofal.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/e3d7f0a7e1929221a52e2bf7e792e16b/lotuweradonuraradolaxow.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/54346988053.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/649398887.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/toturowigojepokis.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/suwixekutixili.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/90950024232.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c208f56514---segajudovemiguxikiluje.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fr9dcon14ohhipo18re3f37ual/50322576568.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d8c8c57b---56597001726.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/fa7987e69715ac1734321f81e782c8fb/81185383483.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/91184723570.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/kusuvilopebutaliwisoda.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/kabuguxa.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/be6224d7e11348cbc78cfdec6afb9003/kinexirumidonukutuwaladod.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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 16648 bytes
SHA-256: 84eef7282de7d40a51027f452afed46f24d055840f590c23df1c6e6f03f4cfd8
font_02_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 10772 bytes
SHA-256: 391ee22f9a94734560396efaa7b0e4c3df35c7db2f4c9df4d0619a70b8ad9121

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