Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a0a76cb3f39946…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 02:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0202f13d89345061a703b4407e2fb01a SHA-1: d68eda311c45bbc9ee14686616ff13aa178734ae SHA-256: 41a0a76cb3f39946a94557d891c0ba9a2b063955b13486d80277e2014d4ea309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8554e7aa54e2e2fca1724bb95e410d2b/puzufexokitarafokuwugobig.pdf In PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a0ab7b12bb27cb04cadfcda9477fe11f/68435142106.pdfIn PDF document text
    • http://promador.pl/userfiles/file/jutatokusuzodaruvogusafof.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/xuzedunukimax.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/deviv.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3314f03490---gedilal.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e26ef2a8a---7018722176.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/46c60e5600546a544b8854cffbebbe33/31319115758.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/timarugatukujunemul.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/danokage.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d549f2191e---48085370439.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf378a4d3c---31335658835.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f6c6caba---9003649759.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/juvubedinajibuxorazas.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/surufavuterotike.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e30a4435c---43507701923.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/57cafab42fc9ffadb78941b6b3c0ee6c/vixapatojegut.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0tudionaemg5urui8lm1lbdja/jofogufabukamutebol.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0310a2c9---sekigumobowirefuwaxeni.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/kepoxumudeli.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac3bef08b---senunid.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8bff740a39f39b4758ed9bb8becb5b04/75962483880.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/rixerogupupeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=diccionario+ingles+espa%C3%B1ol+larousse+onlinePDF 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_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 18328 bytes
SHA-256: 38d80590d86d736a17e4124b7f301a83f59fd32c326654ca3950694408d0af11
font_01_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 10760 bytes
SHA-256: 3d6c81b265165e52cc7dd536e72c5a211e37b06cb2ded9679058889b03e69096
font_02_sfnt_off000142e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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