Malicious PDF — malware analysis report

Static analysis result for SHA-256 951be83179624ebd…

MALICIOUS

PDF

88.2 KB Created: 2021-09-14 04:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac0c6666bc9f84d90b07db1ee0ff896a SHA-1: bf725c1feb6a45670564558be12f384e295b11ef SHA-256: 951be83179624ebd1310e27cff4030abb4e018c180b4c638a8d8e35c393dea9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO-based lure, likely attempting to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=diner+dash+android+apk PDF link annotation
    • https://dnmpaint.com/sdcc/images/file/34027085108.pdfIn PDF document text
    • http://caythuocnam.org/images/files/25848934850.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/gemamefivuvepoxebelena.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/85538417971.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/30172766713.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/71560040138.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/30d2ba54d731f0e42737e5e1681d8f4c/93284455322.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/tilanusune.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/58723426998.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2a65a189b---15671774339.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/vikefagudasasanujuvidedo.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/70697989032.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161331d70abdff---luxoxikevuvadosajajalam.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d1c681fd---muxenofadedenipekif.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/46747794827.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/vonalumo.pdfIn PDF document text
    • http://htwy.com/upload/file/fexavufivesizajojamisux.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210913_61B6336CB7F706A6.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/wasuxaxete.pdfIn PDF document text
    • http://8njl.com/userfiles/files/94441404066.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/95568416114.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/66065077986.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/54775174531.pdfIn PDF document text
    • http://vning.net/filespath/files/20210913114555.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fo4lpkpapvgpg6snl88bavtfuk/matekalaruwepigib.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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 10440 bytes
SHA-256: dd7537e9039b5c853c893a8e732811611843ac690111d43f9839b5ec594cb07a
font_01_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 18936 bytes
SHA-256: 21bba89f7b92a367c31f9c33b4f39e4e54f9a1ec52701d7aae57e2860eb0d87c
font_02_sfnt_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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