Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d96080ee7435166…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 14:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 317e7fcfb85c100d6bfc5c498cbf2eae SHA-1: 09235638f42259815a82cc8beb86674a0521d0c0 SHA-256: 5d96080ee7435166a1d7f0c0e000fddbd5c53fff2de01abc9e01e3773685023a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous external links align with techniques used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a33d681f2a---71777369583.pdf In PDF document text
    • http://mrybalko.ru/files/13525921860.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/73cf9040f2cddd392fe6ad92c728da41/48534662405.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/remifabudanutibisegokigo.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/10399800119.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7ba167aa---zutevazilemolelipiwarolat.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210822053608.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/dda4ccdc3d6162b81b7d9d7f03c52d1a/34865566164.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a831968af21---27983249587.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108180408054780.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/nefagutapopogilinomi.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/20739112315.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/2bb32c3f255621216d26a5c735e373fd/genepomina.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/16948787887.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tqenjfnb6lm114aic0oq77j35k/67132638373.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/31573173585.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/lalupumeregixewamizefi.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/16352451198.pdfIn PDF document text
    • https://pmms-online.com/assets/file/likulabesizaj.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/60263027588.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/xizugemomitujiwisidoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=export+pdf+to+jpg+windows+10PDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10808 bytes
SHA-256: 93c453a9b1538b358de145680bb1acea08a457f9632f531861a3223538bee287
font_01_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 17312 bytes
SHA-256: 38ee8d852d1db890e29a179155cf892d979d6f0eaa354d79e5338d2e501c1ec8
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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