Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a269c5756ee7f3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 00:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 657cb7b4dbcb401d8bf4d1feb71366fe SHA-1: 68ad3b871764d8ca810304eaef81ab6730684393 SHA-256: b5a269c5756ee7f3c6e622920c9695ba74ee478b4e81f5a394b8f10610cc58a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to leverage SEO for malicious distribution. No scripts were extracted, but the overall structure points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa010081---43220377129.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63512e8ad0---jemeferofafetonese.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/72296884257.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e0fbf7ee---nigekekuwabuzogepubegoji.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede0cbe29ae---lolexuzasiruge.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/26356171576.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/mazitubozumexevafevife.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e88fe1f0af39971644d9a73d91069cdc/12150332844.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/cd454305427f2fa473e8d2063516b890/8651606200.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2402d20c5---25165015021.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/57006626320.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/rojulikefaresuriparodijop.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082635eaf3b8---46423538362.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9f197125---52208025571.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/80478974034.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/37235309533.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2123aa1bceec22fca6ff04563dc9002a/bivan.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/3610630385.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/42582048730.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/57285575098.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/wekeluzajisokutal.pdfIn PDF document text
    • http://arslanemlak.come/file/83641788824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=colour+fastness+to+saliva+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 19740 bytes
SHA-256: e00d7ff9589b166d91b8063bafbb252a51fd8a0eea444002024595883fefbe5c
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 10688 bytes
SHA-256: 84e20a9c1340d484a9dc7bfd3f2491dd1801dc00bdf22b3719abbf6f3012e143
font_03_sfnt_off00013730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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