Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb5e9a216e85aeb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 14:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e0b6551e520910b49e27e7cfbe82d0c SHA-1: 5e3271d217e9b38b98a77b683216d610510ea754 SHA-256: dcb5e9a216e85aeb7a62f10f00e713d3c9c41e6ca90346107450465526759552
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm designed to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://oniceh.ru/uplcv?utm_term=shadow+fight+2+special+edition PDF link annotation
    • https://elemental-ia.com/userfiles/file/zuwefijoxubupi.pdfIn PDF document text
    • http://snsi.jp/image/news_file/laxugasitan.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/felebobuma.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109032005302257.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/55e2tpbqp02fjekdrpmo05ksjt/90505758557.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/vadunikejina.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/13881052787.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/jujepozonewudirazipadadu.pdfIn PDF document text
    • https://anaksemut.com/contents/files/69734448644.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b444cfca---dedabebokibusolibofo.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/53295453570.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/tulevusogafovada.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d65c9a15e---sozuxi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/tigotifidepozidugubet.pdfIn PDF document text
    • http://punaide.com/userfiles/files/viwebatuxinexewimasixip.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f708642e1f---35852955725.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zawobed.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/dalapaduvilosobaviwa.pdfIn PDF document text
    • https://esvigo.com/upload/files/zofogokulebebulubafox.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/88720054827.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1af4deeb1---6342144079.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/84942814941.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vesuwojugositigi.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/bamexil.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 17748 bytes
SHA-256: ced68dab35df45a595a2ace167502a40b195c41f29df78e5c61d2152026d7bbc
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 11080 bytes
SHA-256: 8d5013d0222b4104f8bff5ce6675331daf177268a68fbe0d646ba3ba69ffbee8
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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