Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67e6b22db9c25f7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 09:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b6edbca226fc02b7f16fae1501df7af SHA-1: 35d4779e9726fb19cad1d7708526ec691397319a SHA-256: e67e6b22db9c25f7235e4dc833a7d2e6837b7c67a87f36dab3fab603fae7aeae
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hyswimpool.com/userfiles/55705348513.pdf In PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/xosamofujisulakonenupi.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/34281778839.pdfIn PDF document text
    • http://emaaravm.net/upload/files/43118895905.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f3794721e---mopozitifiguki.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/duwitifefepexuzekiza.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/jazusaxa.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/17870128485.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/27777686214.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/21847172847.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/kafodilonizadojuvak.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/29154637674.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/mawidujeliwosegorufi.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/zenomuwesexurinumajute.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/sorulufifomolosi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f690d772a6---21152678110.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/xoravokijo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70573882902.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/vifuwexa.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/84526937834.pdfIn PDF document text
    • https://kede.org/userfiles/file/99485399115.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2nurpkrfjp3jcgpqc4l8313d3e/lokoginivutaf.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gozowek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=8+ball+pool+hacks+iphonePDF 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_off0000de88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE88 18172 bytes
SHA-256: 2d3561575c9e01d26041176a6e22c13094f67a518cbb35820930e86f2c247063
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 10616 bytes
SHA-256: e91837d495dd010fe77ca2f431ff7294b70412c8b69efb2c8dbd323e436eee80
font_02_sfnt_off00012548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1