Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f59d4525b9d7586…

MALICIOUS

PDF

92.9 KB Created: 2021-09-10 09:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de4ad8c876461a7e8e957df30cdfda5c SHA-1: 5ec907b05f12ee8f7eaa368c693ec8abcfd93592 SHA-256: 6f59d4525b9d758650bddc53ab7f0a807fe43c4646346d37c8d9f518153233a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, directing users to various external websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=dfh+machover+pdf PDF link annotation
    • https://biogenetixpharma.com/ci/userfiles/files/80222603013.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/19463041605.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/44731422803.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/19301201665.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384c71b6afa---23720368043.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/40411287568.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133182ba5b8d---momawumakuxeb.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161393259e250c---jegozop.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/76301640921.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/semivitupogadivatuk.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/95248123602.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090305245773499.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ij8c112eb4j7lbk7lhauh38d2t/nafufelixidagosibom.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/jasoneruwaxetugig.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/wuzadokajupefilotop.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/pisomafegitukodoliriputer.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/90444361232.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/mitebovagudumivugagob.pdfIn PDF document text
    • https://music-group-store.com/upload/files/48480443945.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31162427295.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duxar.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/lotozereza.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_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 20072 bytes
SHA-256: 3a2ad7535b05052868535994c3fa77dfbc5dddef038f7e332f4dbf7cf8253fd5
font_01_sfnt_off00013657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13657 10444 bytes
SHA-256: ee652ed1e005147275171fac6658f85541c898c20c7f0f2855dd50aa192b2cf0
font_02_sfnt_off00014e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1