Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f678ea017fbfa53…

MALICIOUS

PDF

89.1 KB Created: 2021-08-06 02:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: faede36f0eda3b718101f57c36108151 SHA-1: 70dc90b0dda6fd7f4454c27b8498127020e5b1e3 SHA-256: 6f678ea017fbfa537190bdf0f61d87d3a2f96778c80a4a5267aed0590eb3ff84
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://stilistspb.online/public/files/uploads/files/xudikupudopopifiz.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a4e4506ba---3575996515.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39dc980984---nonolokedejugor.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e8dbaad5---nawaxatapedobi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3170c1a4911581b71816601a7db6bc8d/74842114641.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nj5d09pd2v81rh8lqaaagbj3fb/71509992411.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/mijobubijamowikuwafu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/cg4uvueljjkcfp04ojl7oj1mko/47102618357.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/ludojarozerubonalomuga.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/83e4fc233f4566f4588b5a1d293f15f7/zitaziziju.pdfIn PDF document text
    • http://egonseetour.com/FileData/ckfinder/files/20210623_562069E3085D1CCE.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/14343203898.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/60262106403.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/dae1ae1193fbd72ca27bd4f89b1dd6c9/fabop.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/medesudu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/37581308849.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54155618682.pdfIn PDF document text
    • http://wamer.org/userfiles/file/lawojolatepoteza.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/minefuze.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/poxagawimudefu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/64965845085.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/vulunutaxizosadegulekoji.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/28495338963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+cite+in+mla+online+articlePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2e1802cc---33959281276.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_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 10300 bytes
SHA-256: 8d0c7907edbf1ae7a83b72d66de424ab53b63f5aeee0c62f169b7344a0850fe2
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 17140 bytes
SHA-256: 1f7e6ce1a602382e84bd223c62faa447cc24dea14a15b31ea56e01b44b3a2c3b