Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91e2920031911d1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 17:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 51758e332488ff909156ede520d73071 SHA-1: edcabb6dd4c67dddbe9708b3b1e6f50fbb54c2e0 SHA-256: c91e2920031911d1245fe369569994048f8f479c67b2efe09ba2b42f71c8a743
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites utilizing the Formcraft plugin for file uploads, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple unknown URLs associated with compromised CMS upload storage further supports this assessment.

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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c798e906e09---pokipiremuzux.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/pepimotutabinej.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e98b4dd81b---16650555238.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7143c095d---jurevalufowinipifateg.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2b00751c---felulat.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b62b43fadff35658aecad889762c42d/72061070579.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zojabevabinos.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1037fe1db668e5b39bad969d84999238/binaleniputubagomek.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/78289774892.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160887bf765a8f---95595262158.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/tegetenetojib.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sunageguzijokize.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5ca99be4---47588436582.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/69625166814.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bejonozepi.pdfIn PDF document text
    • https://promise-land.com/upload/file/gurufazebun.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca90d9d9cb---897127569.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6567fdc2eed112dedcfa23f719a47f59/9272534250.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/japusogowetowonawubivo.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/simebadufojo.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6ec22f5fa05162f3311bd47f0a98df50/59376260764.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16121852f3d1eb---16431906330.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2dd35aec---poriwukabanupibufege.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/mesituzotebiwege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=schengen+countries+list+2019+pdfPDF 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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 18832 bytes
SHA-256: f346afdd9bfb1f97380dc2f433b0401229dd73b0ead2c9c51237143be69b57f1
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 11376 bytes
SHA-256: d87831912727ef6e1b35f30989edc805fe706c825cd426f0d79eb192d857b063

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