Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a2bbcdf8019521…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 05:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8336fbda3300d3c621e0cdddb00552d3 SHA-1: c4418412eaf4a9cc2c50f787dce52068eec9621b SHA-256: 77a2bbcdf8019521094ffab6c18940979273f9944e055e67777828517758b5eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely for exploiting PDF vulnerabilities or redirecting users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=happy+wheels+happy+wheels+happy+wheels PDF link annotation
    • https://webkapper.nl/ckfinder/userfiles/files/tezivibime.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/mivenusu.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/nagasunasarobiz.pdfIn PDF document text
    • http://czminghe.com/upload/files/lavunujalemiso.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/46455287237.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdfIn PDF document text
    • http://fitviewer.de/files/file/90109556569.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pewubosaluregod.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99753386583.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/38336123550.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/24419395503.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/duwatelutus.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/33126125508.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/levopumanabomuvomofut.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1fdcead---69606220106.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/67240078404.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/sugudipixitebunibewesa.pdfIn PDF document text
    • https://onecre.com/images/content/files/80026810109.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/xejimeleperofosozot.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae64782ced---89225241973.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613931c862ec4---nakefifoman.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/667fbed0bd39804c78cf9031d768c274/guwosovexisodumezila.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613229748057f---muxumegisox.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/sixegepagora.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tabobutirazalefedif.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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 17008 bytes
SHA-256: 9c965f3550741afa5ee9113c0b9af8b28670c37f7930d74c302e5576d9bebd99
font_02_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 10024 bytes
SHA-256: 2ad83019f3155d7d4aa62c10d7a03cb89da6069562ec9d377bfc40ee26fb5005

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