Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a8bc6f5b5aa508…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 21:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f77c98bd2697497b117d2e3072d0b3b SHA-1: a1927a91605fc79caf4694234eb425ebdcff26d0 SHA-256: a4a8bc6f5b5aa5086de3b0a89c912069b9f13ec2bac0a9c77856f4f9d1a1e8d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. Heuristics indicate these links are designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a911dcace---69611108227.pdf In PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/20770899780.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8313c578---69483306940.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/begalerizewizagolikukiwow.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607082e94748a---53797524822.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/mejivusopenave.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6572b93284---bisetora.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/gebogumu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b4qf2i28ra0a3eim3gk6o0befe/vorivibubujapi.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/faluxo.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/domiregosunitaxepaza.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/38695336934.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7a9c2d7bba975bde5739a247a05bd3ad/mixebosanemogotidomapam.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/komunuxirivabunibaga.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/65433706064.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/renafobazojefesenawexo.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/61680337531.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/sotixotokaf.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7283503d---15791168860.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3901f1cc---19113325981.pdfIn PDF document text
    • http://net-marketing.hu/images/files/78355982752.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8fd619156---jebisefev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=b+pharmacy+colleges+list+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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 19588 bytes
SHA-256: 4b88ead1693ef976ba18c0294f0c48466fb5d104cbb1649a081c1e79fb0c603d
font_01_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 11128 bytes
SHA-256: f9212a47ce849c875ddaac99a0a0f2e88b693a5bb5b0a0bd3696dc495c10ea0a
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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