Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c19290d14f98b7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 19:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2b0d92dede01acbfad3650c20276f823 SHA-1: d0f5090a85bb28cb90188bf67b599655672cbfce SHA-256: e6c19290d14f98b7c758144520581107d75ffbb153df880d4f8794530c34d8e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains multiple links to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ntt03757t7i38iqvmc2glqdat1/naratevelalotufififi.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/doregedu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/065974b46f11c39822dbac0074347987/35670228363.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/sanogabovopevejupiburote.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/55425947563.pdfIn PDF document text
    • https://laps.pl/userfiles/file/jomovup.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wowuxu.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rafoferinesanu.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/sakotusozudezawibonatobul.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/46260560059.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/zigakivaf.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/48726510040.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/sesujebakemigonoz.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/betanewujijesip.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367e4280043---dajori.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16138a30d16f06---98577909195.pdfIn PDF document text
    • http://fullx.net/files/29937134157.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/86164499775.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/gurabitonavogaganoranuxa.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/63461898450.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/77676806126.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/sivelazopera.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/22952635378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=auto+call+recording+hide+appPDF 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_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 17676 bytes
SHA-256: 7a27b671bd2ef49d42ea37b4ec1bd4ab34272d3f55df48a25eff700bb2d99c78
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 10704 bytes
SHA-256: 11fdf34c82fc61ae5cf0fd34efdf0f403e387ce1003480188a95be2347a8a3d4