Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de6be2bdd6d0fd0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 02:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84cffc92302e77f0dad74e55e522170a SHA-1: dc8c79794ab64a3f434615bbc5b7ccc57e412078 SHA-256: 8de6be2bdd6d0fd06795e1f26272362f807acefa1a12119b319fa0d9fb395043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=gta+vice+city+free+download+for+android+google+play PDF link annotation
    • http://qwerty.pl/_data/file/lawev.pdfIn PDF document text
    • http://rem-proekt.com/f/file/97257854820.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/bekugemebofoj.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/63618972490.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136ca848dbb1---55897321381.pdfIn PDF document text
    • https://anjingliar.com/contents/files/95688064853.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/51090561774.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/rofoxiveki.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/devesuwozudelobib.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613291124e54a---26582183672.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/17591991094.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/83125813480.pdfIn PDF document text
    • https://sambelteri.com/contents/files/24668259197.pdfIn PDF document text
    • https://geloracinta.com/contents/files/74699774638.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/nurapofugafugobosomu.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/88553470268.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gomelefijurunetedevu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kovapaleg.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a69b48ac73170a15b8014e8a17a64019/88150999672.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906181528.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/12129120635.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/paboj.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/53e0957749335a04a807e7a19cae71c0/rumibadebononobupulow.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/90016126471.pdfIn PDF document text
    • http://billsky.ee/files/file/kogolitafabowonagevedo.pdfIn PDF document text
    • 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_off0000e3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A3 17296 bytes
SHA-256: c1bd6a1d47a2ec2afb2f6a1080c7cb3f0119958598e9c4c7f9bb7a17fb04885e
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 10932 bytes
SHA-256: 81b1a6e2f6df73f6c94bf2bcf6f58346f7631a3b5b3263e04ee6a83c9a85addc

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