Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850cc73d7f5435f…

MALICIOUS

PDF

63.6 KB Created: 2021-09-13 22:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 240249997ea7c965b2d50e87ec5f09c8 SHA-1: c0d4e565660634a1d30e22014eb088fff192a82d SHA-256: 6850cc73d7f5435f07736971af20725d68b0f783c114877f9fbd2c7729433d4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest potential exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9473

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://corpusbg.com/files/fck/file/jegopegabutonukew.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/dafagosatukagofutebefije.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b0bac44f---ziwowurawalinumu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/bizuguk.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2cedcfaf---16098627827.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/busenewurejupumopasezu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nopip.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/84906132305.pdfIn PDF document text
    • http://allycatering.com/userfiles/16321120213.pdfIn PDF document text
    • http://hflchw.com/upload/file/wakojuwakazadoveg.pdfIn PDF document text
    • http://autovoda.ru/upload/files/3369914490.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496ff22ec---gipopasule.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/98835936788.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc17ce78e---vazudaluwufoparukopamowan.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/98626611756.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a3dd2fc90422cf2280181e2a98aa5f6f/rezibupakesuju.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_961B084C7ECF3019.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f989bbca3f---vitugaverurizomorikujitog.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/83644316923.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/kezofafutikuz.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/59496214010.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13b6574d8---36359113778.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/vopevebinoxovogawisefi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f8ecb7e70---veparozivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+legend+of+korra+streaming+englishPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC240 16972 bytes
SHA-256: e18b60d9787a3a0c5d4fb09b180201a618067a6e2f75c1e74b89e8c2baf92373