Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae3b006ae786ce5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 01:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be90030db6bc032465fb90907ba52d68 SHA-1: 251ad7f140f9c44fa286b8c866f51b1b314dab8a SHA-256: 8ae3b006ae786ce55179c72cfa3a7811bac26966b5461acd8b66354bdfe13860
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading payloads or revealing sensitive information. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=new+headway+intermediate+fourth+workbook+pdf PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef28c75630---wuseburanobuke.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/difudo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/98354352565.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/19253769266.pdfIn PDF document text
    • http://waterreducer.cn/d/files/23796112316.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0de6c912bf4e169f16553af544cf062a/jabomoselimidipun.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/90947387595.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c039c35cd---89232369988.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160751bbc71772---80235300538.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/98984247655.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ac05e5f4a52aa0e46b073a1c4a95136f/35925436146.pdfIn PDF document text
    • http://24cvety.ru/upload/files/92832069748.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/85247829965.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/kabiguzokoti.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/26643879619.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/detorexetuzogide.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/vuzebukonusako.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ro6uvv0mag9erlpk7uqmggbf3f/vaxalo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a275e0a3858---57494231807.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/81224604026.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91c47b64840bbe5db944a98651bfb446/76216456811.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/zavasesov.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d5f0a4aa8c44242f4966d959526aad9/gejivuzogu.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_off0000c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B0 11060 bytes
SHA-256: 7e0b98225b9d31fd3207dfe5132f6c262a2bf5c1eba7b96456d465579b32a462
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 19540 bytes
SHA-256: e47f3a86c9927f0621f447fa95514d3b6d4a795fd4eefc48d395c8232adab2f3

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