Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fe4a3068d381af…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 14:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8ba01b126a1c45dcd90d31689246ac0 SHA-1: e59ebaff5d11354192f732c656c632c77fd1e18e SHA-256: c5fe4a3068d381af76ca430d775a74df5e2dae3d7d8c4677c31c28eb7d539ae7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=premiere+pro+video+editing+software+crack PDF link annotation
    • http://zhjpharm.com/upload/files/85371319198.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ef1n4liucoqfggvvhsrq0715lh/pinaxetuzar.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/luxigopimaxekoweta.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xagakuzabuda.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/56483939806.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/folujupiwokajewefevepitar.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6f2b7b5---1495164945.pdfIn PDF document text
    • https://davnosti.ru/upload/83639864429.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/wafijeginokasexoraj.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/92073911430.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/31087109870.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xejamesixokarimifepap.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kcq9u4gcoj7qstaqnlmvmu42o4/sekosabixuwoleduxegavep.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jusosisesifikela.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/zegivinufuxila.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/83224080563.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/dilitafamaveb.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/nunodekopatepodebe.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/52256091305.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/xojotupopirisuk.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/39974273544.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/10713675302.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/rirefodezulobo.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/felaguzemedo.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/99940896857.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 17540 bytes
SHA-256: 37c79bb16ade3e805ac7dca05c782d83039a9cd01fa5de89e33960d231af0437
font_02_sfnt_off00013709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 11164 bytes
SHA-256: a9ea66578ed8a630dfd5b19b3acbec454562d675334fce2ebc127cf5d9f23f78

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