Malicious PDF — malware analysis report

Static analysis result for SHA-256 868d83712c39aefe…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 09:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 812d2b5e68e273b2a4a2b6ffbaf57dbe SHA-1: 9244013b18aa7c1f47d509a7edee69c0b8d45315 SHA-256: 868d83712c39aefec6d1c79cc89b55f97dc41894c7d629353de12170d4e06eb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://goodfortune.hk/UpLoadFile/file///jelifise.pdf In PDF document text
    • https://ww150007.linebot.net/upfile/files/20210910192939.pdfIn PDF document text
    • http://erimti.com/userfiles/file/48884673274.pdfIn PDF document text
    • http://longhoang.vn/upload/files/jubipedepokozan.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/49740044572.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pot5mhaj1spc66o0ap3pir3pe2/15375443232.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/762c7efb59b35efe432336b8815dc63f/84476451587.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/2644801389.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/78741234551.pdfIn PDF document text
    • https://priscar.com/documents/files/28479006067.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/jadidinafitejuxozo.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lunuxama.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/33529648471.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/36805780276.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/54741448836.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/39943379182.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/37653629250.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff2c29b5e---wuzakoz.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/21974634776.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/pisizelo.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/80014925581.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/48961425998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+advance+download+2020+apkPDF 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_off0000c07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07B 17032 bytes
SHA-256: 6eb9524a458c25186027b869f4ad4a41d82ebd7cfb48da10eed903074bfe3333
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 10808 bytes
SHA-256: 1b67f7d57fe97ba8e50e29b5f1592c35633ae4eb65f53020944b4cdf27bee653
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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