Malicious PDF — malware analysis report

Static analysis result for SHA-256 2037139bc277311f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 17:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9cee863d5bf8bb3e925b727a36dfefd SHA-1: a68bed068f02fdf809bc8ef3371d202a5a4e4514 SHA-256: 2037139bc277311f5fae39ca732df043e852b7cdaa6e3d734e3f81326b60b7c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The file's structure and URL patterns are consistent with a phishing lure designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://corpus.bg/files/fck/file/68822416076.pdf In PDF document text
    • http://silverk.ru/img/lib/file/zubejejariwidanop.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44014493995.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/xofazidovinakezerulab.pdfIn PDF document text
    • https://trystsalonri.com/images/file/gidajotuwojonesafunular.pdfIn PDF document text
    • http://artediapharma.com/upload/files/vavukatusow.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/77779016832.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tvn1s2dp5jlu4ren65hp4rsqg6/32629059365.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/peretunolive.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/gezunagavot.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/51138494069.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/24477499371.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ecacf76c---vanugasebenepe.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/numilapotititalowol.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/10830901700.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/17532762546.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/satig.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/13240424090.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/81140303769.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/veduxalodeboborojonanub.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/sudewuxoresemosuxebuv.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/86767353390.pdfIn PDF document text
    • http://dasbluemchen.com/lowarizeloxigeli.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52eb7ef31---bulodigetejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hello+neighbor+android+9.0PDF 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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 17508 bytes
SHA-256: f05afdfc5e78fc13d7c42df33ede5660973faaff0a97c628fbc58d3d2373e68f
font_01_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 10748 bytes
SHA-256: 37868f8fd362336f7ca7cfbee685c57457583b4de72d227e785619ff0e9997d2

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