Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c06def8ee62e968…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 09:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba73cf58e297c2b4701af72258a8f9a7 SHA-1: f983c4cc70fee94b0171566ed8a983b334e99d81 SHA-256: 6c06def8ee62e968c80c073078d579854e7f2e2613d5e730ea9c142c5e197124
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tongdaidoanhnghiep.com/app/webroot/upload/files/dezukiwusigib.pdf In PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/20481593113.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/caaea0822475c4937221cbf7a7154f17/70789725122.pdfIn PDF document text
    • https://razredna-nastava.net/files/50640075934.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9ff956a9---59674525185.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/beresu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079725601d30---nateletiguri.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/79368263357.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bddab045dd---navozipotowapufigari.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e1ee9fc699f050c7a3c8c1235461f8fe/sutufoz.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/vonalumo.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/sifif.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/13837587872.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ec36102b---pamenafirexanezemoj.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/kedalagiritud.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/jarasorimexox.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/57620386263.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/lejunifu.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/sifuvekom.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/96707362170.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/80j5lgp13r3mh9eof6g5i5gotc/72740293275.pdfIn PDF document text
    • http://secretinvitation.net/images/files/nuripa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=factores+ecologicos+de+la+salud+y+enfermedad+pdfPDF 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_off0000ea24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 19128 bytes
SHA-256: 4c52fbc1621099e3a802bcda9e7c36462370cd6e725da729526c73c47965a6a8
font_01_sfnt_off00011b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 11156 bytes
SHA-256: 00da2c317065bef4a75010852ccec72f67bf2debfc9750b9c87c7243657ff8f4
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1