Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee64b9b9d3e3b721…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 06:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 348b2216ce6ed1c5e36000cd7b36e037 SHA-1: 4085022a5aa513c956c6fc41be9cef6b65f7d4e5 SHA-256: ee64b9b9d3e3b72112a94181a73b024840c422c70cab80bb52955b1f04135435
176 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which point to various compromised CMS uploads and disposable hosting sites. The presence of numerous external URIs suggests a link farm intended to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sanga.asia/userData/board/file/kebonagegomipufuzowujiv.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/69425031820.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/23479608029.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614941b8a5759---68160253705.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/24603043343.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/96691269399.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/71814748838.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b399c92a56---25370537844.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b5be76cfc4bf8b908e86b2579196fadf/bumazom.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/9425738957.pdfIn PDF document text
    • https://ms02bet.net/contents/files/4272595338.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/97190221535.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/rukumazij.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/pevigeletujopojubiku.pdfIn PDF document text
    • http://bienbao.org/uploads/files/gexozutozuvukedub.pdfIn PDF document text
    • http://hflchw.com/upload/file/buwupeniw.pdfIn PDF document text
    • http://egitara.com/upfiles/files/98695447768.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/vekejixu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/57797734474.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nuxawosusepipaneka.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j23p13gqq5fau4hndj18rqet4f/25460508419.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/54960859750.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/josazojole.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/wusekevaxalunezixajok.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/43075766942.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/27492653263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+9+show+wifi+passwordPDF 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_off0000b1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 14040 bytes
SHA-256: bc6eb038ea57c9c4ca3389dea2db249111a06f12bd4e0bf0fd5afd98739046de
font_02_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10552 bytes
SHA-256: eb7a35947db622904db7d2dfcd56e5f06229cf5e17e69f4e2a74bd55e473687d

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