Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cdf0f95155f6c5…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 23:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8aefbe9f32051802b0f43561f84af55 SHA-1: 51786df4850aea8727b68bd5bafa419a63184d0b SHA-256: b6cdf0f95155f6c5c75ff20f4b2cbfaa2cac4cb282883bb492c44ce99b110367
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to external resources supports a malicious intent to redirect users. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ms-beauty.com/ckfinder/userfiles/files/vogasetuvewixusebuwukojoz.pdf In PDF document text
    • https://m3csrl.com/file/lozuzexuxuz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/obbbsp38c89qvmods32c88b096/17248073637.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/na9r9bb8jg2g3ollrfhc0htp60/vajobimunej.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/20890799767.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b151b270a---36947338080.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/90710f1672c0d9e8f0cebb1b534f8051/23022585406.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b181b45---wirogotikabifojapoxudokun.pdfIn PDF document text
    • https://network-italia.it/file/fipowerotoka.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e6f836eac---48050863691.pdfIn PDF document text
    • http://ibb-online.ru/f/file/15462203601.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a1c4e144---62737657479.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/62812782895.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/87341036659.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9658abeee---jujijavixatuzulutezofojag.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/868f11f6d3dc795c8a29ed274d4df60b.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/30a3a67e9a12b5aa081da2c0f7c50423/3594967051.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/jesazebopogefupo.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/65759407439.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/fesanagiwadit.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tfla917r8a14t74rc2h0kpkkho/71336816602.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f416e4dd5f---65154186429.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/41a85a2878b8b46c4ffcb8dfa70a52e1/57134199465.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/zanoroloj.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/ninujovujuvupibewotuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+lexical+approach+michael+lewis+pdf+downloadPDF link annotation
    • 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_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 10936 bytes
SHA-256: 1760f7de0e0e4fb56db35b6bd7e0315a1230ec977cf2ac3aae37187ef8754f75
font_01_sfnt_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 15080 bytes
SHA-256: c6d0850c0ad497518a2f1809283fe33f98417d61709e386e8b86a8509dec2acf

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