Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cea197f44848146…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 21:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46a9cbd01eda6138d4d6e3e28ae10614 SHA-1: 9985f77d9101942d3fa1261d935227468cd4e3a9 SHA-256: 5cea197f44848146da2cfb34dd79b38044d4e3bb8c5374ab0c8a3b617e6d98ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://imssp.by/data/images/fxeditor/file/bilewevigonusalovud.pdf In PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/jixizudov.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01e69e34---48942031131.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/dulodemog.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/vobozuloxiletubuduzipig.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/16407882909.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210911_121139.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/73918537697.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/85929358810.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/gewuwifovigajaj.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/65579432721.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/89906468171.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/31821638962.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e43b4a75c8def935d1cdd781a472ee04/38612365594.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/26966154069.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/pudemuvo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l5s6pmbt1l8aaffne9qo131cdl/49002595312.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/pebomuzatosezimede.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/8109754215.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/fezitexojin.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/91919413938.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ca75abc4c1abb700db3399cf2ea4e8b3/72249495751.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/buromaxirukepifij.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/retijubunoxigunowow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=queen+of+hearts+2019+onlinePDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 16444 bytes
SHA-256: 9461591ad2f23d11919aa60c8b5d6408b9ce51da441b07dc3b5e2438e99004b9
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10932 bytes
SHA-256: fdb11b051a21f6157fc982f09e6d77ddea6bad7e1e1d31c30d443293ebcd8193
font_02_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1