Malicious PDF — malware analysis report

Static analysis result for SHA-256 59667ade867978f9…

MALICIOUS

PDF

76.1 KB Created: 2021-06-27 22:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f088269716321f22e6e9cfc77e424dc SHA-1: 9ea9f0e9374e604da8dd72e5274b4c156f91f4c9 SHA-256: 59667ade867978f90a3ca59e825690b474286d22b257415f9ce5c02f256d74ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crysiq.ru/uplcv?utm_term=watch+reality+high+full+movie+online+free
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cef8921569b---repudilidanegaremifenevog.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/40657809487.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jegafisumupega.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/37233510561.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ffebe92b73b1034f969250ac72b3cac0/49038485846.pdf
    • http://ilovehikari.com/uploads/files/fozamipobijexinenazud.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/9h0nq0lhbl4upjisqhs1hmv169/kijefetofudisuragavepozi.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f580f146f4---binovivumiputerovisimolu.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94efa86be---66080912830.pdf
    • https://299-45.com/CKEdit/upload/files/jotabu.pdf
    • http://ajisushionline.com/uploads/files/61666835919.pdf
    • http://lab4050.com/upload/editor/file/26430973326.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8dcbed0d1b54635b2e2341ccfe36b43e/gunubozutaboxuja.pdf
    • http://staresecurity.com/userfiles/file/womowejurazeginunaneb.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/891c8f275d47c2bc05adeed52a64f5f0/12564732115.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a567026065c---ligosadezawevofemeneno.pdf
    • http://chayka-svg.ru/files/zefafezezeliwe.pdf
    • https://atamergranit.com/userfiles/file/nopejizewiwixomamerutix.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b486d00238---72353814620.pdf
    • http://kipia-nn.ru/userfiles/file/33947952052.pdf
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/1239568451.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a13fdb54e476dadc13579d281beb4020/sonominiroduzol.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9362205eac---xinunisufozogibiz.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_off0000c6ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BA 16792 bytes
font_01_sfnt_off0000decc.bin
fd7c0c44046554d67ffe67c710c24b81149e3f3f7a364fdccd6e521dea430190
pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 16620 bytes
font_02_sfnt_off000109f3.bin
1712b78ebe5f561a44607418035766dad5f8c2711e8a1e88afb64873d8d2116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 10888 bytes