Malicious PDF — malware analysis report

Static analysis result for SHA-256 482190cc9dbf0d04…

MALICIOUS

PDF

90.1 KB Created: 2021-09-21 00:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 043fe96672b2a7e7193216777d93ee1b SHA-1: b80ff4d92bd3459371f2b010e111389c9adf1bf8 SHA-256: 482190cc9dbf0d049fd19d49ecb16a68ed71a460420bdcd2fefb2e8eb4d99659
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various external websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves embedded JavaScript to facilitate redirects, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4217

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://doellefjelde-mussemarked.dk/images/newsmail/file/57086211853.pdf In PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/3224925583.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/80531307147.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210901_366C938AEE93B5D9.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/pagitasabekura.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/jesezomibipirerizimixuz.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/burubefuv.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/rupatumosel.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210909075845.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd1d73be54---gifasegakakuzepof.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69a6a89ca---72283688711.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/3986571903.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210912_194525.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/35145310606.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/mufovuroduju.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/25539782454.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb6f9c4b2---85806962180.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/44382247408.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/mumepagakekaporerab.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/11651502173.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/32340392875.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/98932560144.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/bugisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=don+t+breathe+full+movie+online+watch+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 10824 bytes
SHA-256: c7336610663b6038bfadb234f1a2f7d622b138fa29cb5293e03668c3aa62a6c9
font_02_sfnt_off00013cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB8 19208 bytes
SHA-256: 582128139250400940540ed59474fd23fd01a227289c7c5332b0d3591b490843

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