Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2c7c297a188b8e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 02:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99599e3637317e454be114a0167b5bbb SHA-1: c0604f698696170b5e82f25fde9bb01488a52be6 SHA-256: eb2c7c297a188b8eb7241fe5a9b1fde27370ccd2da2d185e95740ba4aa6f26e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript further suggests the potential for malicious actions, such as downloading secondary payloads or redirecting users to phishing sites. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://becucci.it/userfiles/files/vukifededi.pdf In PDF document text
    • https://leosservices.com/userfiles/file/87811757114.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dozaxekopi.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/kikobigilowiwetojedasom.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/xudutinebigevedagaka.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/bogefup.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/g93lg9giglv3rr29mrvkm31rmf/dadutozajuzepege.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b836ab3a3c31018da167f1807a21b210/sopanovunobugakug.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/rakejexizinis.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4g9k7tkr2vt9u38rqkikkbvgai/sakogodokivanutemabur.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/50061085748.pdfIn PDF document text
    • https://fptica.ru/images/file/xorox.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/19622629746.pdfIn PDF document text
    • http://sdes.in/uploads/julisufirowudulopa.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/josupiloxeva.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/fanenesagijezapo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/fenota.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/4f94fb9e072aa0c3881c762d59364615/dinov.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/14316355616.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d82e1626715692767a3b404231f179d4/lesovud.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161003e0232b68---dorik.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f403b3110---wonon.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/23145243471.pdfIn PDF document text
    • https://hgb.se/filer/file/poridibipowuja.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/sapoluzagitunise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=active+portfolio+management+book+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_off0000c363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 11076 bytes
SHA-256: 8d24d73b4a7b30f709020eb168f83db7efbdfe427c2c1ab5f3d2f5ecd01dc5b5
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16864 bytes
SHA-256: 753cd382460c24e9239b675f732c3c01a075a9fc256427d28e90311ec18635d3

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