Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c5db7cc59a1558…

MALICIOUS

PDF

81.0 KB Created: 2021-10-19 10:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec52d649edb0250dd0410883a36de8f6 SHA-1: 7d403048241737137d49205e0778985028ad6ecf SHA-256: 38c5db7cc59a15586aad3c9ba0f93da942f8c33522be8c42e2586afd3747880d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, including WordPress sites, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL findings suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tincorner.vn/uploads/files/46084018298.pdf In PDF document text
    • http://standdominica.org/files/files/20092447146.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/vowojemavaxitudibi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ce164a037a6547089aed41ff5568240e/xigerojer.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/kanugibalewar.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/46665953589.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161624a9027630---gozujapuk.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/sowavubuguxi.pdfIn PDF document text
    • https://grouptm2.com/contents/files/14956867166.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sexebamepil.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/97019598386.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a356529760215c8505f0b86a6528e7f9/zevowovigumotunepiwo.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/sisubigeki.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/zekuwulapowurep.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/39125226818.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614445667acf5---jalolesomujotokajurowuted.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bekiteka.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/17380407422.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/litugeve.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/tezekogelowiw.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/pofofuzasiwore.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/xukibuloxig.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/maxisijisetulo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/17249383968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=theory+of+machines+and+mechanisms+5th+solutionPDF 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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 11052 bytes
SHA-256: d1d1ba55f3c0b0bc3c5f8fd01e1cac93386849c4fdd7521fc1b915090be47fa0
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 18156 bytes
SHA-256: 2edc4e88336f86767d5f6f2ce3c110cdfc9bcf7f85fb2b890d06dd84b0495781

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