Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6d2ceb73a82b64…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cde0dbf27057518609476c7be44798d5 SHA-1: 0d09a890bbc1e62f7a9f3ea44e0d4fb5d5f58d86 SHA-256: dd6d2ceb73a82b64f8ef9b12a092cff81b073ec33d5f3a064203d607b0c8c41c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous extracted URLs, many hosted on compromised or disposable domains, indicate a link farm designed to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=the+maid+tv+series PDF link annotation
    • https://kalyna.ua/sites/default/files/userfiles/file/muwexejezifelaf.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fodepoliliwiforeluni.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2760f377153b2e42a6e7ea1269d97c0f/70896467845.pdfIn PDF document text
    • https://coil.hk/upload/files/poketare.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/mozikopu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/673daip5m67uvhemp3tgbjqbi5/nelogofide.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/muzosiwe.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/26843702254.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f0211b3fda2---xazororejidupexuru.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cadb952343---zumufadedoxatip.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/61541654231.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dkecn5au2gdodqa3eephcca2a3/jojixaxopesumel.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/peruxowafubigasedibopa.pdfIn PDF document text
    • https://avvocatoboretti.it/file/43724063587.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/20837842976.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/maxibijudeliwevovo.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/penexozuvekokopep.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/sumegaratosagibudokijumo.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/kunuzamilulofewa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/2519485751.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/genasejazebimozigokine.pdfIn PDF document text
    • https://bdcomunicazione.it/file/87053930150.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_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 16016 bytes
SHA-256: 60bda54aecc35f7fc34e26ddcec92b15ad5d043dc24c43c3763003754a151c24
font_01_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10272 bytes
SHA-256: bf37a8403dd2fc69bd1541387b08d20be37f354fdd265646132130857535a077

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