Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd7f659552e2eba…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 08:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a03ea1c46a2f98dc0458ed44df0b6aff SHA-1: cc6ea244bcdbe22c41c89eaf1c78dfc7a90ecc4f SHA-256: 8cd7f659552e2eba7e1eb21193b7c969e9b32c6e4623ff93bf6dd304ae338669
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdf In PDF document text
    • https://gastriklandsbf.se/UserFiles/files/97368431761.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/53084789321.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337e9b40fcd---59038186721.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/wuruwo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/77962066840.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/5219169454.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/41643642040.pdfIn PDF document text
    • http://susutour.com/userfile/file/80121198433.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sonezusikedofafuxinidowo.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/wirekarogujojexodifugaxot.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/79330398049.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/dosasiwebokinadarum.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sabaxubejolero.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613951821207f---51889618021.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/46810132168.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/wixilopukonobelerogab.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/lamexozobajavigob.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/vorinovawogamesezud.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae02880a89---fagivubo.pdfIn PDF document text
    • http://dentistturkey.com/image/files/45607946228.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632460567_426fdd9d93.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gipilimonivefafokogi.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/2498011874.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/95487896285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hill+climb+racing+mod+apk+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88A 10684 bytes
SHA-256: 0df4d914620e866292bfb2726aabb020bf66c344c099d00326d52ee7b781afa5
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 19148 bytes
SHA-256: 9cfff97cb70d874b3bee4257ec2cbad59520ca0491c44f5d208a04cd66a142eb

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