Malicious PDF — malware analysis report

Static analysis result for SHA-256 2974cbc3f2075256…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 14:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ade1121efa676fbae06e493d50058ee SHA-1: 523f1d7eafbc52772829089ff0d8518ba9f21fd6 SHA-256: 2974cbc3f20752567d2943bc1f681d2ee71a0131e79a9bc5655e28a4589cdb99
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload directories on various domains. Heuristics indicate this is a link farm, likely intended to manipulate search engine results or lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d2da28b7---mofuxosik.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h3p0r23rrm9bcnlu07pds6ef99/7713909974.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5390952dfb---40047159428.pdf
    • https://kuepancong.com/contents//files/35025001170.pdf
    • http://majorpropertygroup.com/userfiles/files/zawegez.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/bonuxefexoratojivupumivo.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a4aaba4a9153cffee31909cc866049e3/wusek.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5023e59ad8---rubuzufivolizido.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/58769359451.pdf
    • https://xo-sound.ru/userfiles/file/gesozamesi.pdf
    • https://erdemlerkoleji.com/resimler/files/57738103720.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f38bd71d693e701b3770662026184b03/63162713347.pdf
    • http://ipublicity.cz/data/file/12997163307.pdf
    • http://airconbank.com/upload/fckeditor/file/8345237364.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08ac5aa35---93183204932.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092adb523240---95244830615.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=anime+series+torrent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e835.bin
02f8dc74b117c7de6ab04454c6a71c30c07a678a2c751a85ddb4820cfc4b516a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16468 bytes
font_01_sfnt_off000112d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 16792 bytes
font_02_sfnt_off00012af0.bin
445a163b30da3900ad5744bb4afbf4611a2b26544a7e219a6dc35e6f1c76377e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 10040 bytes

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