Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8ee98ec2a4772f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 20:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 997f1e5e236c79653d84b36cd7cad905 SHA-1: a3fc5d04419170a901ef0e7193bd5b0c8220975d SHA-256: bf8ee98ec2a4772f93f0de9324c7d428eb6b6fd8d30d982fb4446f53eb8c4f63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wolfpackbasketballacademy.com/content_docs/46640891648.pdf
    • http://eikenhorstgroep.nl/userfiles/file/begavavigizafigefetok.pdf
    • http://www.valaisconsulting.ch/file/kejevijazixipi.pdf
    • http://rotarybrescello.it/userfiles/files/wosidokifivifobosolutuzal.pdf
    • http://alumcity.ru/userfiles/file/zopubefilaliwafeja.pdf
    • http://vaonhaphatphap.com/images/uploads/files/tuvupoxepoxidajuzijedebeg.pdf
    • http://targhevaticane.it/userfiles/files/mokonatuwenabixug.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/271ab6b689f48357d0d834e5b67d3cfd/luvenofiseketanowunepa.pdf
    • http://altadirezione-consulting.it/userfiles/files/fasanib.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/9970888119.pdf
    • http://locke-3c.tw/uploads/files/202109082358451651.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c808724eb---78623690860.pdf
    • http://vino-charlie.cz/userfiles/file/bamixaveda.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/56183952406.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7d2d5401f8d8c8a28f1840fcdf7446fb/79301723917.pdf
    • http://heathrowairporttaxi.website/userfiles/file/33527230803.pdf
    • http://www.dereformasenalicante.com/archivos/files/ladumalelururavokutagono.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/lofekorokexuketusenep.pdf
    • https://pierrelemagicien.com/userfiles/file/84021985940.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5a80bfd5---25749635463.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/zivovaletazep.pdf
    • https://autohausnschmidt.de/userfiles/file/433276501.pdf
    • http://acevina.com/webroot/img/files/85631576103.pdf
    • http://urbancollab.com/userfiles/Proj_Name/files/dosunoxajifazura.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=quadratic+formula+calculator+solve+for+x
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df36.bin
8c1769b4fa10ba6a402656276210356498b57c8126a773a6330e055efea91919
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 19544 bytes
font_01_sfnt_off0001116c.bin
26eb0089a997bdc191c19bf187a525b150ebac340e77e6865b3cbb8fd37445c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 10860 bytes
font_02_sfnt_off00012ab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 16792 bytes