Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc8acc0afcb4091…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 10:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 859d4fbc07aba5a131370bef9d22c998 SHA-1: 454c8314c568af07e49ce78665ffea71bc509cd2 SHA-256: 9cc8acc0afcb4091fc14d00a57abc27caf741e6b8594cad03ff2ad2ddb59d930
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • 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
  • 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=fluid+dynamics+lecture+notes+pdf PDF link annotation
    • https://prokoncept.hu/admin/blogfck/image/file/55659623894.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/reginokizorasakesapij.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/mogenerar.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/takesedisoditeminat.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312e084792f---ganamotilomamiwewuv.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/durux.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/16876328126.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/lokosizozov.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/11965234095.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/xenuzodifazuximudadetox.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613587379f035.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/25144410517.pdfIn PDF document text
    • https://haidangpc.com/contents/files/poxazavevebojowesoniwuwa.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xepegesel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b7977199.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26450324810.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140597a411ac---vedetatetirataxukitolopo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614521a2cb85c---pogimasilegevepovefunesun.pdfIn PDF document text
    • https://phuquiland.com/upload/files/7922639936.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/88251446560.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/nitovi.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091316445697.pdfIn PDF document text
    • http://health-bridge.in/upload/file/84416480551.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/fisefixetapivilid.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/roduxefaxesisag.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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10972 bytes
SHA-256: a409b5b6fb8d14e8af15340e47b5a62bbb9795dd9bccd8134eb498b4f4edf5ed

Open this report in the interactive analyzer, or submit your own file for analysis.