Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db6939c561b6ed9…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 19:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a5f3ed7757fffca13a38e42bb9d4818 SHA-1: 0003c587d41e3d0dc78657507ca45af2ce10a990 SHA-256: 4db6939c561b6ed9dec1e03d1f0556c3b8818713b637b9f03e2a1293173a7573
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drbumbnursinghome.in/ckfinder/userfiles/files/fezoxodomuwarumolorivebi.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/vilojapaligefokigilij.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/nobozafow.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/4308196139.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/53889395976.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/tupufotokixinu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vadafuwavuvasus.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161313d2b596fc---rutigezekebewu.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/71346193365.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/winizibeloti.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/nozevurawegajovodifekab.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/76091930715.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wunogunexanubefo.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/fesezaduweg.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/ligujuwekoga.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631082432.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/13547134571.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398634baa5d---nukepoj.pdfIn PDF document text
    • http://splogservice.ru/content/file/ririvozetarivifubazozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc13ae7b9a---zagugafategalenibegavas.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/lawoxatoguwarolusibidarat.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/fuzofogikevenewuso.pdfIn PDF document text
    • http://kelvista.lt/images/files/kasulilibesuwelebipelizuw.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/wenekepalezaradomud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unblock+private+numbers+androidPDF link annotation
    • 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 15532 bytes
SHA-256: f7029c6c56656b26ca7c87840e9160a15891d50a2f15225ceb211e242a908330
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 11148 bytes
SHA-256: 1adec29461661257d13dbd81cdb90dbed670b7a6d0bcd9f8888ff73b8fb1b6f1
font_02_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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