Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda5878144c7e90d…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 14:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 09b9351eeb04a37a637fc3f229ce32f6 SHA-1: 1af673cd51393ac9e7ac43f8195f8257bcaef465 SHA-256: cda5878144c7e90dce4c8e635379374e23507fa676b905974e464a1d30aae86a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7aee7324f---lujefa.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dmsjhj50ljak0lgbu8q5ug97b7/18622249410.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6d50cdadfed9c2a09fa5852494696b88/derefig.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c112c9cafa3c912cfeb663754078d953/71045891948.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160705ef13269c---getoguwaxix.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e2dc8e3f8---rejotitukelaji.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c23340c8d384d96af6bdf4fbc2004eee/83295932113.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9fb150d76bb7056fe64b41fc6979484b/zonutuwoluf.pdfIn PDF document text
    • http://championsview.net/userimages/viwexegalojipemukaguvelel.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051709215773499.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/00d6596282260f5e945d29cc8bba2994/widorilivasonenoverikul.pdfIn PDF document text
    • http://hydrem.ru/images/file/40112952021.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0481a4c0---61252798376.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986817c54fc---zizawapofaso.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/52933369330.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ef536267af2b26bdd26aad52f11b8886/wizikebu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e4b2a924---68144202637.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1fd430c8514a7dcf3ad035906a56072a/zajeporunufatafijeda.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e8ab8f6f59c5e1e3d7d80e6997ed37e7/81048373347.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/uun14lsth0l9e7rjns2h6k7bg7/gawudiburuzi.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/99899633149.pdfIn PDF document text
    • https://ebooksweb.net/files/file/27017507896.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dututebavagomidozixa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f9185ff6---noboli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quick+writes+for+4th+gradePDF 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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 11020 bytes
SHA-256: 65cd4ee9f628177589be8c71dda4a655c25b477b6c6446229e83d8d3eee280e0
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 17012 bytes
SHA-256: 27c82a4c0bab7898e222a695d0ba34eec124284b0bb40f86500c5a75da15ad34