Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bed1c410fcd1cb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 09:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0fa5239ce62628852d09921ffd8f8f8b SHA-1: cfbe4182b7288f574083a652fb7840a8315abed6 SHA-256: e7bed1c410fcd1cbc7ffdeebc8ea3ee339bd319567a1c1fdb825225dc29582a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lncxjzxxw.com/upload_fck/file/2021-5-27/20210527190455909285.pdf In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a8c710a0e8afd1769c488e1e7293bbe6/614477042.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/30cdcdc512f4d3b8be4cf3a052d02d5a/67919400342.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/80985389257.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tt31g45p5ffjkqkr587la0ah93/bujexufifawonebofivemu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a2e5f66b596e5c2062ac04fc0421e5e7/89697654836.pdfIn PDF document text
    • http://pasted-radio.de/web/files/dugofefixexeso.pdfIn PDF document text
    • http://recrute.fr/files/files/jifalisite.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/727134136.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/pifufabowopanuleginiloneg.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c21203155fe---77903280851.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/80538754948.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/sabubagoloniz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6cb69b32---revobureniv.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wixowepiwes.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210812_e843e.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/49e58dc16729382f436a01ae262e0e04/legoronewasovatukuz.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/89021498877.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tajosikatet.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb2f2eca9---jedolamorimarujonudewujof.pdfIn PDF document text
    • https://o-dance.com/upload/files/4980915746.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/59983457905.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f8b635dcf---jinilexurusifugox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=desarrollo+sustentable+en+chile+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_off0000c4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B5 10956 bytes
SHA-256: 8f00493e8734fe25633da0919abaa35d777bc19bdb856de4522f743e387711a5
font_01_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 18428 bytes
SHA-256: 29526f7b29fec04e122ceb0f91fd24ba7f45f9e3b1bb4012d8773456a26dcada
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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