Malicious PDF — malware analysis report

Static analysis result for SHA-256 6905d50e5cd41e73…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 16:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3170c767fa2f93d57ee113f6340d20b3 SHA-1: 1d33c693c5f40b1269816cb3d35fa99ea808b275 SHA-256: 6905d50e5cd41e73f36eb820f7d076a976f3cc08cfcd166c4fc6fb31dbc60d2c
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://luligang.com/ckfinder/userfiles/files/36778920238.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/de28c3b3df04696df00fbbb196eae1c5/35861151982.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359dae270c8---feranazuvonomase.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906140235.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2b19d154---sonasexaj.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/miredesufeposewimenap.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e2764516---92799775466.pdfIn PDF document text
    • http://logicamail.it/draft/media/gukavelinufe.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/taluzakeviragipotede.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/venenegidurezemo.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/530729459.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/1315442257.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/84215175250.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/99550767555.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jakufojebenotokozanuko.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/38270240042.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vobapi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401bef46219---98609399471.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/34253334292.pdfIn PDF document text
    • http://skisun.it/userfiles/files/loludafawavaberubuxikonas.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914143637.pdfIn PDF document text
    • https://designclarf.it/file/potafozanasujabuzixuze.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/tewaduxamigatedega.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/pozapezedofutosukaxifoji.pdfIn PDF document text
    • https://dukupahit.com/contents/files/gubujuxemosilopabawikabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=transfer+contacts+from+itunes+to+androidPDF 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 17416 bytes
SHA-256: 3884a8476d713b07224d87218cf470c190239edd79a1e0e748e111cfd684eaa3
font_02_sfnt_off00011c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 10656 bytes
SHA-256: 12c2c826fea439fc2b1a692356d1cde6f25ae9a2f3220b81a6bdabda15054227

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