Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3acc0bda3055a57…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 00:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b996e106fb34cdac3908c5b732bb9d2a SHA-1: 3357769d1ea825bebb230fd8ab03d44ab4b49db8 SHA-256: c3acc0bda3055a57f907cb2fafeda01ec99526201bcbc4355ed60cf8920cdd6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a lure to redirect users to potentially malicious content. The primary attack pattern involves leveraging these links to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://casaperferiesantamariagoretti.com/writable/public/userfiles/file/64297840491.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160998ac701880---38095476321.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dfb595c3---pobikawofedadadaxugudi.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/50hqsn72o7c1im5kmd1k5djvs5/59330697802.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90de846b5---78067645414.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/lopov.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/22e54f6edbd31b71691173b97286637a/75318663669.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768d06a57d---52164100857.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/18314812560.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/be778c62c15c8b35450de786318b85e2/rofosolo.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/vafepudut.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f17db129b32144efcd7272d229e827e0/kipofovunasapekuxu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d8620169e5a2d289a9d0b4250c48ee79/65143738220.pdfIn PDF document text
    • http://wawa757.com/uploads/files/pepozita.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae8618cc4---73700955792.pdfIn PDF document text
    • https://x-software.cz/data/file/2773572758.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/bofedibowofozave.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/02bdfb355a568aca1150eb2c788acdfc/godamagi.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/rawikedeg.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/694791621b9484ea57ee2d31cba9f308/ruzowapilumejileperika.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/40674634465.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/59434459137.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/59393502582.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/17040280458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=class+11+statistics+for+economics+chapter+1+notesPDF 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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10828 bytes
SHA-256: b6a0863056ad2b002e2ca1560ef11f7482646a7147f8e60873f128aecf3d0232
font_01_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12836 17144 bytes
SHA-256: b489f4f03ed4b607ed4699c7c43fcd6aa7f52a1052f6289898ed602ba3b46ff4

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