Malicious PDF — malware analysis report

Static analysis result for SHA-256 5909d04f8ebf79aa…

MALICIOUS

PDF

89.9 KB Created: 2021-07-16 08:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbb0200946fc291872552e227cb4acdd SHA-1: 2a84b0ecec93233d383cd212b75d379e9652879d SHA-256: 5909d04f8ebf79aa585ffb9be4c33fc5386c45edac578e13240103a3e07f7a9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=the+wall+game+of+thrones
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9cf40ab1cfe3b19cbd46990656ca5628/pabesopewuzenoribixiserut.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd455372ce---21195491376.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/965aa0f41c6d4b1a95729b25a8c367e2/gijer.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/q8u1p1j9ghjilhmq2bc7s1q2jd/fikozogilotevekes.pdf
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/sobobafepej.pdf
    • http://malbreil.com/userfiles/file/82722268364.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f10f3f3ab6963a39ff748927e0f4bacc/zujazowitotavaxadiku.pdf
    • http://alumnicollegedelunion.org/clients/76066/File/23944157357.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b93b7abe---mapodonezawukojategago.pdf
    • http://biomassasia.net/data_ed/userfiles/file/41377550750.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0oi2b1f8rbn7slobevr3ma72de/57278829816.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab03b6e62---27449008779.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160818c022ad96---vifokorixalirelabijabe.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7a58b9d090205fb84c4f1fc5903f7652/84855346597.pdf
    • https://eminencesolutions.in/resources/userfiles/file/35641195507.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a25c4d54---tifinusogekazuwavekogija.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/55843671769.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/92ii333ub4t2sc4a6fqns3uase/nofuvisedumewunemusugu.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/heb341env4v2vu0kdi2p9macge/60478299427.pdf
    • http://andlupa.com/userfiles/file/zasimepoxekupom.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/05492e0e4871d5c541f5aefe3adc4383/zexijegimibotikorusarofom.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/go93frq1vbguug86liqec75rt6/wijoji.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/19aa6a36c2785114d457f00902596ac7/xawazega.pdf
    • http://www.halpellet.hu/userfiles/files/7542497581.pdf
    • http://autosklo.sk/pictures/file/89753250479.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_off0000fbe3.bin
c9f21cef192ee5d3dc64b23c6b58f0407b62c6f3e0f882bec47a571cdcb63c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 17552 bytes
font_01_sfnt_off00012a13.bin
6c12c16161108183a3bc128b42375141f399b205d4b0060a4b2fcba3bb76b2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 10620 bytes
font_02_sfnt_off00014249.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14249 16792 bytes