Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5fc23ec745eeda…

MALICIOUS

PDF

88.8 KB Created: 2021-09-20 03:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 128c1991d008f9aa43f9cdc6b041bf4d SHA-1: 598eeb67cb6e83fbd698b0e713253faa1a992e94 SHA-256: 4e5fc23ec745eedab2aed15e8ce7be6554e4c866df4fd93ebf707e76aa5f1c96
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social-engineering technique. Several external URLs are present, some hosted on compromised WordPress sites, suggesting a potential download or redirection vector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=palm+swipe+to+capture+m31 PDF link annotation
    • http://www.casasemio.com.br/ckfinder/userfiles/files/wujin.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gesexu.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/53041030966.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/wepesa.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/lonavawijovujirakugavado.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/46651206048.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/44105539398.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8b7e5efa21c84a4eec46428b3b595153/ronen.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/pavufime.pdfIn PDF document text
    • https://totounited.com/contents/files/26153436556.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tenavugununonu.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gekipibe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tmqt3bbvslr4lijdpelt23jcv5/sedoxibimuzi.pdfIn PDF document text
    • https://esvigo.com/upload/files/bofutuwepegopole.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/41654081431.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7f388d1befd6fba98f54d6b4613a2230/8570414873.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/69345502283.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/wepiraduxosajoros.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/parojabejewedivusasogafof.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/29025817268.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/kekeg.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/29293626842.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/42396693414.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_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 18980 bytes
SHA-256: 90e062284389c0cc286b55a7a8dda5b21055bb51ab241c6d6f8b4d34bccfb64e
font_01_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 10844 bytes
SHA-256: 12f7060c0089cb2c562fe615c909ca05891061e540342cee435fc034fe858162
font_02_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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