Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd3f99888a53291…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 19:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccd547fdf1c1647a145ab77a6d46a752 SHA-1: 388a4a8f798d3301c5cab22a6963dcfad9497c0b SHA-256: 0bd3f99888a53291abbfa7fe96ee8b3e7f606dc081f59220acd9552d72a75121
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of these links and the overall structure align with a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fonnepal.org/userfiles/file/22731689773.pdf In PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/9da8116668d0a3735fede413fc1490d9/67565074830.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/11683255616.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717477779ad---kivarofek.pdfIn PDF document text
    • http://stylekd.ru/files/49521647827.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcbed79d7---remikizobivofevepeb.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6d10750e0---51547409417.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/69655218239.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e10894e2a---wesobajo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085dde5899a8---67168369374.pdfIn PDF document text
    • https://equimat-cheval.fr/file/terefibubudotokawosurafa.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/96355190520.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1bbb8a74ff85cf4f26134af1e79dcd5c/69544615773.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/58286727366.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/82008049897.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7324a1da52---34284646858.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba16a8edd23---69315688906.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cb7a2a35---bedapajinar.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/vijujinozavijijulonewu.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/74032696373.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/71406933057.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04ef0b582---rejanan.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a7b8a06bbf74de917500c57ea5843daa/sujinolesedifigozogifagew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=characteristics+of+a+good+leader+in+the+biblePDF 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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16680 bytes
SHA-256: 82eb05ffaac4acb39b16326fa17ea1bee7a3dcfb9a279195eebfbb3a2bb1c9f1
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 10928 bytes
SHA-256: 981a0e9566c709ab71d16b6f3bc00affb0743d8f02ab07052ae470259286970b

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