Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4ad117a3b75ca9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 09:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d405e185892cf36c8a04f1bf723fded0 SHA-1: 653bb66a4992f0c4b963fb5d9648ba8cf97b3a67 SHA-256: 6b4ad117a3b75ca94c7e817c8e5c1b81520a89d8a3f027c022d789f0c4945c86
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9c313eede2a8d3aff2d8f706db9c0746/rewuderef.pdf In PDF document text
    • https://stalbeckers.nl/userfiles/image/file/52724367661.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/zaxijimipakejaja.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d67c832bd840b9b694dea9237d3dded/munobin.pdfIn PDF document text
    • http://myslizdrave.com/soubory/wovonevarovosedefabexip.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/4656846649.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4079d8257---16424105007.pdfIn PDF document text
    • https://geniodelweb.com/file/49478483613.pdfIn PDF document text
    • http://klpa.net/userData/board/file/98672933548.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe7468974b---67375833526.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210829163747.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/kanes.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/76130905718.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xavagizavoraxazomaguvip.pdfIn PDF document text
    • http://www.siposferenc.hu/html/tijuvozim.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/91842418173.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/11897800269.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/dabefulobupiwezivigologim.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115082d7da55---91509701020.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45735cb14---fuwatagogutapezu.pdfIn PDF document text
    • http://www.bash.cl/media/file/pefusadegadebegemal.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2f8301de---83146783654.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pazepelaxititosapisob.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/nagewi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/rezaxoridulejatojujal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=amoxicillin+for+toothachePDF 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://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_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 17812 bytes
SHA-256: 7e5148804f6590b6515003b33da329199dd84efd4b64d257bb068cc005106a08
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10516 bytes
SHA-256: 1cec8f865de1e82fd4073841b9f50ab4a1566a9c434dc177b1d635e8465311ef

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