Malicious PDF — malware analysis report

Static analysis result for SHA-256 32144ede79a90824…

MALICIOUS

PDF

77.1 KB Created: 2021-08-15 18:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8c11253b46b8036352b07b04a5dba10 SHA-1: de5bcecf0585586507d7ec62bfc6ba830ee08d1f SHA-256: 32144ede79a908242d8cf32ecf4c32ac8f619f8cb3e10ba3066b9861c6e9055e
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious content or manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kvbm.org/pds/userfiles/files/92122690018.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609331b0d5376---govimalijajisawupemeb.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/woxikotinovomejiful.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98654f4b5---lapurev.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/gijeduzulamakodujenek.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d967a52d---podizopekasixotonudevoj.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/fofazirusewofenilo.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/mukujinasiz.pdfIn PDF document text
    • https://alariel.be/userfiles/file/poxalejipe.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/33018275744.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/96289151435.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/xikeb.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jiwawusomekeba.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/50277170513.pdfIn PDF document text
    • http://ausafe.net/images/art/files/zafunesopefakebumone.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052612325596.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098ebfa8dc7f---40705263086.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c89f45647b1b5c13511290492a5f2878/27514052355.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f4aa7f005719f9b69b5ba98f61791bd2/20152690507.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/koreparevada.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be87d79e597---86098397952.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062809093870554.pdfIn PDF document text
    • https://wita.lt/images/files/95215626697.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/957bc44a862aca0fe36bedcf69dec157/bodajizop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=briggs+and+stratton+service+manuals+onlinePDF 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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 17984 bytes
SHA-256: 60571f5d3a8167b7925698addf82f4c657e3efc68fef916d9b4e6de71827139f
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10932 bytes
SHA-256: 1bec669d9b89d61dfe0ffc68b5afb93bff68a52a5ec34b27b2fbc240256f8f44
font_02_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1