Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f210b139cfca552…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 04:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acca2ad45a377e443ab5e0e1e97127fa SHA-1: 5d1c64e20da2236f46abdafdcbafe70fdc5d13fa SHA-256: 5f210b139cfca552af3bc775fa561ad3dc11f814efeeb1b9e7512dc474df3c54
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links and SEO-disposable link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608085ca7ee82---jafudesavofeverazubawarim.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/80555a03eae61e088bdefbe0b5b4fa01/20969303901.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b486cc26b8c---votavururapawawitewifibe.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/mejisatofawibidasax.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/tapigikezefaf.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/rizodixuwof.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/3442956900.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210819134244.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a07c020b6503084584c18b900e78bb73/80447828285.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/majarefaxitofolajere.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/52981193756.pdfIn PDF document text
    • http://mousike.it/img_ins/files/37700257496.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/dowifikutemanabat.pdfPDF link annotation
    • http://tivati.com/uploads/userfiles/file/bufadewoputitiketadofuzen.pdfIn PDF document text
    • https://flyags.com/editorResources/file///rufazalodesebovo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2716d86aa5ef26eb83c39dc6e4183629/vepafudoviravijoru.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc0bfbbcfd7---28699900240.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607397774e107---63752995097.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6302431578---tosedozipemepolasigega.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/23945090098.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b49b43c1ef908825b6e379e4232e6a8/pufibenewegigoserulomat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=introduction+to+modern+virology+7th+edition+pdf+downloadPDF 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_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 11264 bytes
SHA-256: fb44c686b42c4c15bf4658811be10821dc0e7e9ffcdb6b121e7a5cc3be86578d
font_02_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16748 bytes
SHA-256: 09a9a8e3b2bd26779262ade1d00dfe18a850928ee51bf5cf021c416aa4d44d1a

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