Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e57ef200c76251…

MALICIOUS

PDF

66.8 KB Created: 2021-09-29 10:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adc1f0dc25cbfc1de1a2b33fa6522a5f SHA-1: a848c1239cb7c59af1a85251073151a521607a9f SHA-256: f8e57ef200c76251d8c809d200c375d8165d84b37bcfb621690d3e73611333e8
124 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and UTM parameters further supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://crysiq.ru/uplcv?utm_term=master+movie+tamilyogi PDF link annotation
    • http://glovimex.com/uploads/ckfinder/files/fasirapevatubosag.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/fudijanutixivadim.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143389767fea---71988995916.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/lebuk.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/54276562645.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/dolem.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/52723808188.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/muvetum.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8b0a9cdd---79548921790.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/pugexuribadome.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/bisosif.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/guduloxudikewoze.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/golodidajimirodokudoxug.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/53159868706.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/zuxakadobalodamokeru.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/50144139466.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/88348030837.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210913013135_829900.pdfIn PDF document text
    • https://onecre.com/images/content/files/fojileguweduxitos.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/23831485542.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/25477844927.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/62909897102.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614789813574b---zamixonok.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_off0000b49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49B 17464 bytes
SHA-256: 11b032c79b06d89af16e58887323dd06b34310e94659bf9100b441f30b7908f7
font_01_sfnt_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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