Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5e9df1f9fee12f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7ec95d879961bd456182d86f71800811 SHA-1: 51a2c87179f7798c5d872bba4da7d57e9d7698c1 SHA-256: 9d5e9df1f9fee12ff1c4f771ace321b6eac7360b6cf609155f9c58ebf2274dea
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting a lure or redirection mechanism. The presence of multiple external URIs and a link farm heuristic indicates an attempt to direct users to external resources, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/31328112007812d60da0f3541195087a/18099828100.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/64882812208.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/57440579323.pdfIn PDF document text
    • https://cncunse.com/d/files/12970047376.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/fa372eefc9b7af4e5c54423b48d74ba7/zifagazoxug.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2d6ff7e784525e926fe14bad7e322584/fedewekotogorasugoz.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/362222d368556b89fe28b5a85dd1a566/lexanuwuribivudukopol.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f70013991561b328ea1e9d708bf0b2e1/xumolifes.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fubozuviw.pdfIn PDF document text
    • http://cuacuondaiphuc.vn/upload/files/42436521176.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b09058620---sawumugine.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ef7c3aa---7147970948.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18a7d6d26---masosisutiguwavobebuji.pdfIn PDF document text
    • https://computerzone.pk/file/lusefutixu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160accce913ed6---24430990225.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/gebivipizanirip.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c3154ccffa00bb21cde5630febd47970/zunawawibadafabig.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a09d03c7b---jorizumotifunujunuji.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/kq9st5cua0viv40ao4pulnv7hb/25786159888.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/58dfe1cd71be4be70fe531e00e09a650/37840093165.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/4317786185.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/jasoxi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/tubakulelaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jack+and+angelicaPDF 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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 10144 bytes
SHA-256: 35d89cd754bed1ed674df651e354b9bd1824710f98e26685fd72625033df6960
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16796 bytes
SHA-256: 51cc4f5e79605771e3de645eb58836ca404dfa1226a8dd69be9ebf3d889880e9

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