Malicious PDF — malware analysis report

Static analysis result for SHA-256 340c551c4b98271e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 16:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 522c1c445570da4cc5c7175876acad52 SHA-1: 66fb63b11a021b4aa9db3102ce8e1d201fce373a SHA-256: 340c551c4b98271e6ceec6e3559335fdb631deef477d8b108c0f2cb9992681ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nawoo.net/userData/board/file/61762895233.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/91554140207.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902091246.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/37639188026.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/70023295292.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/98855091523.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/faparatugud.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/72375072627.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d15b5e8d---refiwufotaw.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/88598160053.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/4286483768.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xuzokegadoge.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/68552847323.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad0707bc---1470265989.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/72479158581.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/10162890081.pdfIn PDF document text
    • http://hiniceshine.com/upload/65377141504.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/85h3a4n8ibvkh7j4voqcn91bl1/tuluzetukufawo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tubemugawo.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/zipekesudizenovufabeti.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lobupaditimujiferaw.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/fezuxogimuzazubuvapim.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kowenipilosipivenematuda.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pegolut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=maroon+5+ringtones+for+android+phonesPDF 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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 10856 bytes
SHA-256: e012ba825260e8b9aea4ab9e9d6865df605bb27e65f91d29095e1431fac0d395
font_02_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.