Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef4111ee5eae976…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 03:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0384a391ec20862fa03ccdfc101980f SHA-1: 01b95334d0e34d01f90836ad6340bad3d4549c75 SHA-256: 4ef4111ee5eae97693824bfb509726c26f82cb88a04e1c2988e98b5eebce616d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external sites. The ClamAV detection and heuristic firings indicate this is a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the embedded links suggests a malicious intent to lure users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3358

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=willy+wonka+and+the+chocolate+factory+tom+and+jerry PDF link annotation
    • http://nonstopsushi.com/uploads/files/paneb.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/48190835882.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xetovobumizavineruk.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/40402416582.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bf6f693f87b68bd19bd2351c7163fe2c/53140711111.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/pibog.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/petig.pdfIn PDF document text
    • http://normel.org/files/upload/file/34693178339.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/duwefalezovanamem.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144856987835---vudaberozixeraza.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/6329573861.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614106d38be05---jokivowokuxaxiberi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hf23ffe5iruk9c9rrohd9oraa7/87632492690.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109120753098853.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/5727232639.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/41926011310.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/maxaja.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/jemejugetetevivufadudubek.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/newopadabinafi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/numudoxifafutubojasa.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/84769998823.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10988 bytes
SHA-256: 69ab4b21ad6fb6205e1ac26d29b7c7eb698346f259a134857704795aeaa554cd

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