Malicious PDF — malware analysis report

Static analysis result for SHA-256 876b8b7642b63403…

MALICIOUS

PDF

892.5 KB Created: 2021-06-12 13:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 231f3b950bc85f0e4b726fc6c8e6ac9e SHA-1: daf07521e66c645db1504fadae91a424fee265bd SHA-256: 876b8b7642b63403f92cce696cdd05575fed6e17245b623e6056538631f32759
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=factorio+blueprint+library PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607226cc7efce---kimokibib.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76a0aa13c---90413105029.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/912f2879bf682518095c5c25284285a6/19040302473.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/111b1d61d7bab819e16dc03b3f471416/97039440744.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd76f2ef579---18573730331.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/kaxifizegibukudurelago.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbafa700e7---50920937500.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dojofoxanenivaxijoxoda.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3fc216df8a79636e32f01525de30d529/nidexufonoveberunudigegum.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tnm1cu07ib7ec9hk70rh3ohtpa/16641707813.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/sonuzos.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kewojilesazunu.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/b3b87eb5316c6abd32aa333a37bbaf15/6654080253.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/227v7je5h1d9ht45qf7gi036km/97059873967.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/11287786376.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p8rro9rbh1vhgcklcb383hkoe8/85381277247.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/20770428703.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f5fe2bdd---govidezu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000daeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEEF 4944 bytes
SHA-256: 808dc4251e11b47893c7501cc66c853d64a0994aabf94891608d8b0f061662cb
font_01_sfnt_off000dbfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD8 10788 bytes
SHA-256: 4c3412a6b67836ed740afc69138e3b9691d137da60df19dcf7a255f2e88a5309

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