Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb186d2da05c5b43…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 11:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb0d0cd115089f9d624df739e7a74568 SHA-1: 5df23a16da694c886487fd06f646bb752258c1dc SHA-256: bb186d2da05c5b436f296c8b1a63482c8609259a1c770d7a63aee44f59b84272
156 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 domains, indicating a link farm for SEO poisoning or phishing. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://palazzodiaz.com/userfiles/files/82377995892.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61f2a99f8---67983107656.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/penos.pdfIn PDF document text
    • https://koratspring.com/upload/file/papoj.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/39199172119.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/47743335880.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/5134618514.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/seginalusutef.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/54426938449.pdfIn PDF document text
    • http://servmed.net/userfiles/file/65521253824.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/bovileda.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ee01a4f4---92441801558.pdfIn PDF document text
    • http://cissi.it/userfiles/files/57156356687.pdfIn PDF document text
    • http://df-2.de/images/daten/file/86244668761.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kexetiwoku.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210914_A79E1CC3881D6D6E.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/71502798128.pdfIn PDF document text
    • http://imi.vc/upload/files/68076313281.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/modimemuradukaz.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///32999998754.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb82899a4---dojovanowonijud.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/jotuwezegagotuwugofolof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shadow+fight+2+mod+2020PDF 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_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 10652 bytes
SHA-256: 869ade81aa6e8361a8047ed377771891feea409507274f7a17b7dd34bb69149c
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 21736 bytes
SHA-256: a2d6b357ec7f043221008bb51c54c601903c651e6f3719cfff6003a71ba39fe1