Malicious PDF — malware analysis report

Static analysis result for SHA-256 e572575b158f46d6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-27 01:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd57becaf529873e33d93ebe606c1195 SHA-1: 59b1dcd05d21dcb611b45c7fd6b3aabfa0228a08 SHA-256: e572575b158f46d6da8a52f77edc0194da176eea2ace099b77f7db53867983c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm with numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware distribution sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=words+that+start+with+l+that+mean+beautiful PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af56c83845---xikilam.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/wopisomoreselomut.pdfIn PDF document text
    • https://basisangka.com/contents/files/vedevifobopifejositegago.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/rorejikogapudaloxebevefos.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/subuvivaw.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/58283335892.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/tiwonatigunonem.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e3f82e2d09101ac3c06462435cec338d/29672557088.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ecb9ec8c---zomarajulasanogodiru.pdfIn PDF document text
    • http://ruresept.ru/files/file/37618591841.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/857e0320a9a83ec1e97e3d2945460840/tigazodib.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210925_100435.pdfIn PDF document text
    • https://majubesar.info/contents/files/88753405789.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631330195.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/vilewimuwezejonane.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/34341485347.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/befovovovowaxugiz.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/guxuninamufopuxom.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08dde2d82---pinekitoku.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/fumepabi.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/venulokidetirowik.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/94078657225.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/21481023272.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/56417564736.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/mufuluvonuxakonibigiga.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_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 19124 bytes
SHA-256: a6f274abdd6a7dc7f081737de0fccc499c0afc01e22b612609b5a99133a5ca2b
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 10936 bytes
SHA-256: 4ac4222a6ff5cc1faeeb7a3a08952e46ed2e305b8da89a5b492f29e493944185

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