Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e9e17956c23dbf…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 11:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89f24393ddf30d455baff2d51ffcc35a SHA-1: 9c696d6b52e320da8c17e6f1211f1069087969cb SHA-256: b6e9e17956c23dbfc681a5269ccd8b47b5011ba073e70a08591d32a13ad57ce6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 https://huuphongplastic.vn/uploads/images/files/leluramofuxutugok.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061304005395.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/73665864474.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/zarar.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3389b5e01d---kitugasidaxixixe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086064f96500---50315974671.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09eb3e8af---gijiwutikozubopugov.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///23890678031.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/sozasa.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/pegemu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bc862030---vekelagiwodijedubivo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ofl0ar9pu9und2ug55lk6gn5av/zufakitegonegizikijari.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/runulixobusupoditinil.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4a6596bf9896ee366e7d17b4368db81b/tuzipevabexuxivomowasadu.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/51412180891.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tuwapavumabobe.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ffc1e9f306ec163f7934d0e562d1ce88/kawopo.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/labufisuxatigeximajaxew.pdfIn PDF document text
    • http://kyea.org/imageuploads/wurejowekizagisajafiza.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/db6c74bba60379bc3aaab7ed23587e4b/kabukogo.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/bibarajomogipabas.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093baa5ef55d---wigezilag.pdfIn PDF document text
    • http://skncn.com/u/files/95929234676.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce52c4ffdd---18920255775.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/47850071869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+save+music+from+audiomack+to+phonePDF 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_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 18188 bytes
SHA-256: 5a828d6102123d394a919f9f59a9c3671504a8b9088e4ad24d1ef4b23d690273
font_01_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 11172 bytes
SHA-256: 0383a3c3ebc7ba7ec32a099aff56de20f8db4a8246f832dfc6eee81ab7132e20

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