Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe95394477e904a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 17:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a4c478a84c6bf9853010c6ceaa6f27e4 SHA-1: 752ca6db5507df46c845cf934574f07d92372505 SHA-256: ebe95394477e904a2c52b897ca528c0bdda34f12dcdce13e5be1613ecda267a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs, many of which point to compromised websites and are structured as a link farm, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=demon+ps2+emulator+download PDF link annotation
    • https://webmanagement.gizicsarda.ro/images/file/menoginijukesimijedu.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wabizokafenubekimurivus.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jetegovajo.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/16388368112.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/98580180023.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/bazele.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/el8v2o22p9hrlqqo4ahtc5megs/83499269392.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wutuzufilis.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/49397256377.pdfIn PDF document text
    • http://imoroz.by/upload/file/71481281724.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wikakar.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613beb52aedda---patij.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/18940887312.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/zozemot.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/mojeniwul.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/776807314.pdfIn PDF document text
    • http://atya.eu/files/file/31837071706.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd32c0723---nenifexovatufoxepuf.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109152158151648909n026u.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614eef4a74ca2---mewivagaxipenujomamisuke.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632550900.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/wenaxapo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/60409002870.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/mezuzaxumezu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/38692997059.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_off0000b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 10768 bytes
SHA-256: ef0e4e6de9785ada903a4431034446c317e80c284ebe800571b53291e884d85b
font_01_sfnt_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 15456 bytes
SHA-256: 796e6a1cea200d0c3e0674699457e6464d1cbe1ee393deae3e99aa9fea43ecb3

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