Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b551dbd9c6d4e09…

MALICIOUS

PDF

65.1 KB Created: 2021-06-25 16:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6e823e3946db1f7408f03d39975c7c76 SHA-1: c54525f1365395bcacd06ea74d5044c9b7de222d SHA-256: 1b551dbd9c6d4e09eeab911e5392abbb49972b7e45b39c6c2513857ede0456f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious destinations. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7163

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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/62e81bd9bf0d86066b3ac8af67d01da6/48934948493.pdf In PDF document text
    • http://kaies.cn/upfiles/210525022328791018nlj909.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/5ea7f294345121db97e96e3ee7e44bac/81143856216.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b01fa99f5a---gelanesixuzananupode.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88e93ece5---woram.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb5211ecc---91833936141.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/78300986852.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655067f---liwaxamujosuxofeduraso.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/julevapisedisa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/19c2eb72ed45bc90d23c9803dbe81f07/sozabexun.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a82d666a5df---69494398164.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ng8n1nhjkct7ir3vkpqn5c1df3/vamerim.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2r34lhlknimk05fr2abrtcl8dq/4009018220.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/80643927458.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/mugotonaturem.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/mulijopojes.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7098reiqnvrceu18nssct48i47/39129194929.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xafenag.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/fokirufefoxalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=night+kissing+and+huggingPDF link annotation

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