Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9478b3624f60a40…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 15:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbe391cd972e85fded6be4c446019c2e SHA-1: 8a459205487eb4d608939f0b10b593d1dcfd1fcd SHA-256: d9478b3624f60a4081030e6f9962d035ab40d2434b00430f2fc52d80b360cd17
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, strongly indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the extensive link farm suggests an attempt to exploit user trust through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://queure.ru/uplcv?utm_term=neetu+singh+english+book+pdf+2019 PDF link annotation
    • http://rcp-ranstadt.us/files/76057199207.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/78826173120.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/mebezovijorusubagav.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/641125e3179c1449028c8f8f8cff696f/56441883826.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8a0a4fb3---fokifenumatabemil.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e5269bde---63264480445.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/zugejizuxokove.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fujekikojonaxi.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/kominuluvadotosodoboso.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6a701097---vixevopi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jadotekelivutofeve.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1051df2084---jekedesatezazowas.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66789531016.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75201958173.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/kitubidowujaxixel.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/54500082603.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d0830d74---balugobezenoviz.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/32040989935.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde7ab5127---lizetivamapepopapidade.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/66017658346.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/kupurimofetojinufubepolup.pdfIn PDF document text
    • 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_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 11288 bytes
SHA-256: 4fe3becd365a079aa59672267ecde29b8798e7bf3c959ca427867c966b9dad79
font_01_sfnt_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 18132 bytes
SHA-256: 7be1d7018d7cfa2526048247cbef4e66ed7e53168603e4ec652430faade8dadf

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