Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe2715c19dd423e…

MALICIOUS

PDF

99.2 KB Created: 2021-09-05 06:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 175ecfea499ec123b9921593da83116c SHA-1: bf6caddf4548ce5f5f083b408a6aa6ec3ed778cc SHA-256: 5fe2715c19dd423e0163d531581664b50bba1ae8761de1d41b9932435d520477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised or disposable domains. Heuristics indicate this is a link farm, likely intended to direct users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://ketchas.ru/uplcv?utm_term=glossaire+informatique+anglais+fran%C3%A7ais+pdf PDF link annotation
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/saruguxisalufod.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/51891086867.pdfIn PDF document text
    • http://limoride.net/gallery/file/girexene.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/dujoremixedolapopim.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/95432345948.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/84161180117.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be82ea9dd8---jelekixuxititix.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3969a680---sugomaliz.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/kenagometigukak.pdfIn PDF document text
    • http://clingac.es/d/files/5513287593.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2g3cb7i5rb3bcnu1eqssv8prsk/tefarexumipezarorefava.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/mimefoxapazuru.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bdb953a13---17523755987.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c63fd97349a545ac1191a0a498b75059/61109384713.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kagaxuzuzenitu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/39446225778.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/13888551630.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/63355613648.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/77871316139.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/mojosimazujulopu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/36672748730.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/76338951681.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/38602135561.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_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 22740 bytes
SHA-256: 1796930658f552a42325ae7b438ca781e26415fca39d0bec6cd6592be7fed7eb
font_01_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16209 11324 bytes
SHA-256: 9c1b694de8ca6f911832d1c8d10603b0e1216055df2db64a08163645a5243e9f

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