Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c8c0c55c31f80c…

MALICIOUS

PDF

68.5 KB Created: 2021-08-08 12:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 763a5be75c8e7832f2ccf82818eaa141 SHA-1: cb19d9586876892975ac336fdd6b7a077e51b7bc SHA-256: 19c8c0c55c31f80c81b53c533a40dd13f650c056d7a8f44604ca2d7256f6587c
174 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and a compromised CMS upload link points towards an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://sosnovgeo.ru/userfiles/file/wozirakeberizu.pdf In PDF document text
    • http://bungefamily.com/clients/5233/File/xapapeva.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/73016659007.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gajapaguwoximapaxazu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9e419ced---90472920103.pdfPDF link annotation
    • http://humanitool.ru/userfiles/file/makosonisibefazojani.pdfIn PDF document text
    • http://chromatographvials.com/d/files/69656187564.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/wajekukubaduge.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/87672135578.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/71852209345.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-21/20210621215145910485.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f96cc0d0f67---jibab.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5482d5004---vojogituxujareru.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/71171830182.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/62699856180.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2d4067f0---53972908202.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0aa4672b738eefb4e7df6c8e7b12ada4/94686168404.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/26726093910.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb9ffe45b7---zomaveza.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/xatejobijo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c03994028---94519653420.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/48968519174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+test+hunter+x+core+sprinkler+systemPDF 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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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