Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7c8688aa1b1320…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 17:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9aef4b7fcfe45429b7d3e48dfa9f1578 SHA-1: f10d6820222fe74c6fa59a2b421a4f2c368d306f SHA-256: ea7c8688aa1b1320ca0308e4bab452648fda8985cd9656891665321fe480749b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf541115---28226179101.pdf In PDF document text
    • http://massimomoroni.it/userfiles/files/nedosivunopevorozabe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c91b333ea5b39e106bf897e4c96507dd/vubotu.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/litutebazezorakab.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/megenogibiju.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f7e50da17---30144920907.pdfIn PDF document text
    • http://kechengchem.com/upload/files/devizajago.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/8283690949.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/2371904368.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0v30vljnrde3h0pi6ukd3gfqeb/tesitugezitudimubit.pdfIn PDF document text
    • https://purefeeling8.com/data/file/zetadosojaneririzaj.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/97665722882.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f2cdbbc3b---joderixixa.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/53174934389.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c80c34952c679e5165369ad35e525262/92652983359.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/jokinulerulitevoxovi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///32382639392.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bbb44f2e---siwigilipepisisogatizum.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210720190519.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/8317154506.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eidde6jamenmh0kdigseq1umj4/66276855006.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f73df1ceff45d7f3e12850339e7e2262/33268929365.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505175337_21456226.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8c58fcbe89669e87bf02fc49cfb6865a/2545896688.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/91594556604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+kill+all+mobs+in+minecraft+commandPDF 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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 10944 bytes
SHA-256: 4ebd143ad8441dbcb9c198ecbcecf2889f0044b1e4d05b351cfcad82fc4406fc
font_01_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 18996 bytes
SHA-256: b28dc555e4ee2085c71388a98a121b31a09d71a614f519dee181a1edcaccd04f
font_02_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1