Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba6ac0b5fec7729…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4eea17d41c84776fc3989aef43e57729 SHA-1: 5ea12229c2344ead89a4ff1cbe0c14b09eaca588 SHA-256: 3ba6ac0b5fec7729d338d805e073ea2c7b4c07ce44fe3bd29660b15452e155b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing trojan. The PDF's structure and the presence of numerous links suggest an attempt to redirect users to malicious content, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb584a46e---diguxurowujedokixegoson.pdf In PDF document text
    • https://prestinieurope.com/userfiles/files/50584726907.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fb49afc7d---jokukojafiwiva.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/88742067135.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/mikux.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/jekivuzamolopejaj.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b38ef16c---jojizosekogarazali.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc87a0a62---fetigawem.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/neneb.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/zapofofukivafub.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e27bfda230ebe4b667a1ed4a5c5add5f/42432803372.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/99054593492.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5c8d5e23---karipev.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/bofibasifagibegawulazara.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/fojapoxujupewed.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/loved.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vujozotajuba.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/48364450013.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/41941054647.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1cc1ef2f723887cc46e28dced73eaafe/33834693961.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b2c151c---71064333996.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/11075182555.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/vonujomer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mining+engineering+books+pdf+free+downloadPDF 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_off0000bad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 17108 bytes
SHA-256: 6f3b54880ca702d59ef7bf7b70758be3834925d9ac115a50ab11d21f9592655b
font_01_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 10888 bytes
SHA-256: c6335447e10be8b1eee29718b4e580a8e18e3943070378e825dddf70e1c10d47

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