Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f0ad761093a628…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 01:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f5327126074685eed61afb1489971b8 SHA-1: 4d665f8e4b0ab67877359da7e9b8f27796a6d833 SHA-256: c1f0ad761093a6280193f9294575645ec23fc05de126559d284c34a239cb510a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting it's used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613886f196179---45483726011.pdf
    • http://tofuyatogo.com/uploads/files/39902425704.pdf
    • http://wish-pharma.com/upload/files/9249699469.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5edd2a1ff7ec900dccfa1e324276f59e/94935717978.pdf
    • https://specialgarden.ro/userfiles/file/koguzowige.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_5614DD83356B6478.pdf
    • http://milwaukee.center/userfiles/file/newukenori.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd30500400---85066872527.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91595380191.pdf
    • http://brunagabriele.it/userfiles/files/xatatuzirafiv.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142576136fc3---morodir.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea5b0c439d---40652581817.pdf
    • http://vncdata.net/app/webroot/uploads/files/19651524193.pdf
    • https://polandpools.com/contents/files/kipawadon.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e28e5ba4e---52396056433.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/97527141787.pdf
    • http://regmac.net/userfiles/files/nolije.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/basuruzutik.pdf
    • http://yeongwonenc.com/userfiles/file/97673223264.pdf
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/15315802818.pdf
    • https://12shio2.com/contents/files/kurilopejejo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apn+for+wifi
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf64.bin
64371ff25bd9243285c46f3d95f4ee073f544cc5ba68f2380e34e9d7c2766173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF64 9812 bytes
font_01_sfnt_off0000d501.bin
e5fc0185a22584d7b923cdd713b7063619bb30cf02f63891939c6188df6ce72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 20476 bytes
font_02_sfnt_off00010abd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 16792 bytes

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