Malicious PDF — malware analysis report

Static analysis result for SHA-256 754adc4bb83fa74a…

MALICIOUS

PDF

62.5 KB Created: 2021-10-18 00:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c6cf63d4849eee7d0048c9074f569f3 SHA-1: 16a2116675c4203b57efb99b44049bb54e553bb3 SHA-256: 754adc4bb83fa74a790854146b19ed16ce1d3158082511fb22df9bddb6e5f025
154 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a phishing or trojan distribution intent. The ML classifier also flagged it as malicious. The presence of numerous unknown URLs suggests a high likelihood of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5125

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 http://www.contal-farmer.com/uploads/files/16949968931.pdf In PDF document text
    • http://golfvillageonline.com/userfiles/file/773234480.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/44962232721.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/23456438177.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/87983063967.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/sigigozobovilirurulo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba114f914---17323919117.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/13625422174.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/63962373244.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/12853061698.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/73375077479.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477ee723b8d---63141421542.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d168c92a0d3af56c15c9f0a5e7400bf9/85473241310.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/44993652741.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/44774861469.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/16439613541.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/470958c6ea73b900f31a732e37b565b1/fikapuzalunusu.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/xazilada.pdfIn PDF document text
    • http://bresky.cz/res/file/75434061445.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/lisudadeteloni.pdfIn PDF document text
    • http://spharma.ua/files/file/76878799340.pdfIn PDF document text
    • https://camelcarpet.org/d/files/57956328331.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/9d0860c7fb369512c2655bd6071e8c25/89748912130.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/22347921765.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16165ec70e1fda---guzegomemenumole.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/kodobebavelap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=theorem+the+sum+of+the+angles+of+a+triangle+is+180PDF 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_off0000c236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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