Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab54e9a74a562ba3…

MALICIOUS

PDF

99.4 KB Created: 2021-09-21 03:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 847e524aaf2b2e44f57aac317cc7a5a2 SHA-1: aac2b63ded73f0f93e9c6bba83c00655bbc43e02 SHA-256: ab54e9a74a562ba3bf82fd6563b7d1e2dbe39e19e966ecb3847debc7a65b45fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm or redirection mechanism. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a phishing or malicious content delivery pattern. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://oniceh.ru/uplcv?utm_term=aplicaciones+google+para+android+gratis PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138940d46f21---nikofegobiwemugosebob.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/41931030915.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/jakapitukisaro.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/botaraxojidezetiku.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/koloxarokobedeveralalal.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/belarib.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/78389700225.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/remewalivi.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/38560799827.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906152041.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/49443719956.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-12/8eb3a525142187b18d00323023999a50.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109170754574803.pdfIn PDF document text
    • http://hkalc.com/userfiles/kegibemaliwonase.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7c882602---62896750417.pdfIn PDF document text
    • http://geotersrl.it/file/85215342456.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/tosesobazuj.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/27345114759.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/92772706145.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76ef616e9---mipaso.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/jagokigevududafevavakevum.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/poxewekapobopigutuzoxexir.pdfIn PDF document text
    • https://ccskin.com/geektic/files/liwix.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/wexixefejerodoronatij.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_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 10672 bytes
SHA-256: 45f4b2947a9108f9b5a5b5b850605a53666e8ef27f04eff60c24755d41c8806d
font_02_sfnt_off00014c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6D 20264 bytes
SHA-256: 3d0fd3a5d2f90f7d4d0f3f777a3a17d2013c4ed6d5e02fd529e02930ff051f72

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