Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc5b59cbece5ff3…

MALICIOUS

PDF

61.4 KB Created: 2021-09-26 06:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df1890fec53a38badb641ebdf3503d8a SHA-1: 9d8f14c8b09de79d48368a4366219f74eb7b3262 SHA-256: 7dc5b59cbece5ff30edd8288fe23216c58b81fb9333914116fb8e0cfa4d99ae7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7635

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=nova+launcher+settings PDF link annotation
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d3e406908d98843d6db6cd76039db819/72085063163.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vuvisibasez.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/bidufezoximubuperebuke.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/94832215053.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1fcdfa30---jafuvexebawobuxanuwax.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/mudotumojumipukabufiz.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/bunewebiripasudegepupal.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/xabijamufa.pdfIn PDF document text
    • https://davnosti.ru/upload/vivopado.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613261b9126df---85310774800.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/pabonoxulijukozowod.pdfIn PDF document text
    • http://net-marketing.hu/images/files/sawezemobuwegubawelet.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/42364089594.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/52908857624.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/najarepakozoleb.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/2684528874.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pumupuvodiwutaxorifej.pdfIn PDF document text
    • http://llux.vn/uploads/files/xufediguwata.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/zidorafomugopevivugelo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nurarulifojufofet.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///16906090568.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/renevabateboji.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_off0000b2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AB 16956 bytes
SHA-256: 6566c9b957691b33f4179c80d0cec27c21a43a66eda068e9d235885f1d5937a6
font_01_sfnt_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10652 bytes
SHA-256: cf698297f41af51ea5b3da8afd5e2119c672177222528512c6de5c39789ec077

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