Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2a573db1c131fd…

MALICIOUS

PDF

81.9 KB Created: 2021-06-29 22:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5fb9c1dceadf4ebc6300ae400b1712d SHA-1: e3cc21051006186b276ad96068b419d7c47bc2c0 SHA-256: bb2a573db1c131fd09f440b75de405a8be48e4f321b8b71097f2dda1254c047b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a link farm suggests an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=the+new+high+school+musical
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/68c0c600458abf4973bac9422d6a4a14/11268410092.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/adb432880a0af3d1c4fcfdff3c6cbbd7/91266833047.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead7f33b03---gorepafekek.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0186580956---71004867355.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b0f2de3eb58378b1e03d6c35706775cb/segati.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6996ff90---minetomijale.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8b884214---wazagawodetovev.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/varanewexezuf.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a730a8e6da8ff475d0c2e86a44c931df/88762331675.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/56256187fd990328c8a89b222f59dc21/vupedufonot.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9292d4482fcb301ccedfe05b5689570f/jigibovidejusumomide.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/1145168246.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/8c0fd1cbc312aa139f3b46f331080b9c/raguvurunakuzutetodujum.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9326fba9f1---vemabanesuf.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e93f5e226---xalivinupotigukevesawe.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/53658486707.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b682dccc0e2f5ec19d22971f8aeddb6c/nuzusuzetomosob.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/682d5028b9c8c036c8c8687bc94fe68a/loduzoriromofavapinus.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f74c29f4e---92778538691.pdf
    • http://orhs89reunion.com/clients/77823/File/firufabezukafojizixuk.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/qqr20tr3eeoemhqrm7tfle3tu3/35046127886.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7810b2e71---47636572625.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e18e9035e2---larijanitemewazit.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd901edd0---67288026566.pdf
    • http://hocikto.info/userfiles/file/rovupigibobaditula.pdf
    • 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_off0000dd2b.bin
b14c09aaaa39e096408d97c3c86f0a2a95c80e91028c9809e04818195f64f02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 17188 bytes
font_01_sfnt_off00010a26.bin
a9d4ce98635686afecc482a7da03d5a0573b6c07c7533e0962cc4c6220de7a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 10628 bytes
font_02_sfnt_off00012255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 16792 bytes

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