Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9c1e98ddf74c03…

MALICIOUS

PDF

87.2 KB Created: 2021-07-19 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6257f4a3d05dfafa79b459ad74f0f2d6 SHA-1: 7471e2ff195f86c87c50326841183d41c3169cf5 SHA-256: 4d9c1e98ddf74c033f2fa746a589c753261a633f1864bfe9c8f2ba635b867f0e
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm hosted on compromised WordPress sites. The document body was unreadable, but the presence of numerous links to potentially malicious URLs suggests an attempt to redirect the user to a site for further exploitation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pp5fvdo6uca9749s5tuacb592/mijosirunurinobib.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088173c0ede6---16174481359.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/jufifipematunonepema.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb951c338bb---xadefuxazevirotojij.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64b60cc4a---76208357378.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/60176613125.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d3e22f51347c0a83a8f01bb4914798b9/61181265945.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f4e177380---88038824481.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/63999740628.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/sofoze.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/zuzigulule.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gm544m7t0s81alo69cms9idp9g/fimesamux.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a188f707801---70656478579.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/272e01e6804dbb260084eab5b66a2f14/7700858776.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/vuwanusew.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/10317530837.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b590ea52d41---17532735904.pdfIn PDF document text
    • http://potlista.com/file/files/24066631519.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nowikewedotuvojoni.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6d24348b19368642e7ca3af01dbf21a5/lolokefufozuba.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/fd5273aee751194d915776afa193fdd2/87060211272.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/55851495430.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lbc7s336ma4mrq075untdq6nv3/fuwovebix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=provincetown+to+falmouthPDF 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_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 16844 bytes
SHA-256: 8efaf158e7876fe5c28227461bfa4320ee543328e0f29eec6a6fa93699dc44cd
font_01_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10688 bytes
SHA-256: 560fed7d904d6129b1af1e3964bde0087833996924f32040361923a35c713bf6
font_02_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1