Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62802f058c4cd8a…

MALICIOUS

PDF

86.1 KB Created: 2021-08-26 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8dfd08b04b50939646405dcbe1abfa57 SHA-1: e3cef5154f43af0025a25036fae5ecc89263c9ad SHA-256: c62802f058c4cd8ad0ded7af67b90e585cdbf30335cce36cf1bcb4d5662c1e5e
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=corporate+social+responsibility+of+reliance+industries+pdf PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d15290073725505eb892529deaf756ba/84546612891.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/82736470153.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///belunewewivazidowokiwot.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dfe30a230---sugiwefujawisiga.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b14952fdd---34287527554.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d3eaaac4e0f5a10ff4306c748be847cd/lisadasakitewaniso.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/puwaxogubidadopugisot.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7273c158ed354fdec7e06db15dfda5e2/68598212031.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/5353653323.pdfIn PDF document text
    • http://aa-nusd.jp/pegega.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/buligubokesalidififemu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/9a30fccef3df71b2b40ee5e57ffee9e1/94502219989.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/tevegufewafuj.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fe35be339b3---tipikilodasirodafu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a69c8c0c---52314462696.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/tokelufanasutalajatezek.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/46390345439.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/18389313805.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43814646455.pdfIn PDF document text
    • https://abeess.com/userfiles/file/doverekilogoxanevukuz.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b34c010a---59593466528.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe427da8d75---lozopoginedovokobolososo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/xurubupakadur.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_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 10996 bytes
SHA-256: 2cffe08168511722f866b0e8b68f92a7805c8d411c78b33266d680daffbc2c2a
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16620 bytes
SHA-256: c6e2516c2044190a76cd113ac09e64a074073525e7e2d2bd38f48da5c2d43ef6
font_02_sfnt_off0001324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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