Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7a0b4b53c8c70e…

MALICIOUS

PDF

91.5 KB Created: 2021-07-30 11:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6fdd9569a11ea44554d79b7b33c62ebf SHA-1: fe2cb993e9730209cd5590ef7c488afc0682ee9b SHA-256: 1a7a0b4b53c8c70eb912df9df34f58cd02b5cf1ce41d3e2345a715be2e0e8e5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggests it is designed to redirect users to malicious content or phishing pages. The embedded JavaScript likely serves to further exploit vulnerabilities or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://synerhu.ru/uplcv?utm_term=star+delta+control+circuit+sinhala PDF link annotation
    • http://tourhong.com/FileData/ckfinder/files/20210728_A0543F5A3F61DC1F.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803394ac4fe---diviraf.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/gqtnqk6sfin09feli166df3f5l/12850423466.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0a4271d0b118cf6c7888f5402e7096cf/denekabopaguv.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/77566081507.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u25geuen268rgrf3s54o0glck5/gepubigib.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/27984602820.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/subimumekemopugoko.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07cf819916---85582574190.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609f64753195d---71619086473.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/tuvimutumonuf.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/dcf5f45eec237d39e00e61ae054b6e16/gijisazegutuz.pdfIn PDF document text
    • https://everestart.com/images/stories/file/ruritarigukavisetuzegaxi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/oc4qbcam9ettf6p28lb3ll8srl/15041705337.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160835e19cace5---jexojazam.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/lidovi.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zopoliweralukuvipazepidef.pdfIn PDF document text
    • https://rajaunited.com/contents//files/18845467735.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf6bf031f---zuronesobavopatopazu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8f755c918d1c9f91923b443edd36644f/rolivemugatekezokap.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e179a087d---kowagozix.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/0e4aee8a0bea119eb21e9f337d1c7751/kewojuleluwotaderar.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_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16824 bytes
SHA-256: 01199d4be5d4f498a7c09972dc20dcdebfa3cd05411f3704490085423418ca0f
font_02_sfnt_off000147a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A9 10644 bytes
SHA-256: a132a22159644089566bb838c58d6bb07e1d30cdafc6cd029db6538269d27acd

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