Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ef9594adbe43b0…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 19:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9812d20bedc3f69a5f1072d590b9363 SHA-1: 9bfbdc9f357d2aa8226a6f6d1c057628bd5bfb97 SHA-256: f3ef9594adbe43b05ff66eb12bbe398ceb53cb332b0fdfbd4fedab2733133010
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document contains embedded JavaScript and multiple links to external PDF files, some hosted on compromised websites. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for gaining unauthorized access. The presence of embedded JavaScript and external links suggests a multi-stage attack, potentially downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://u-spot.biz/js/ckfinder/userfiles/files/bebibin.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/910ff72d8d46d99a7ffc9f0884d839c2/4849738705.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/81081428385.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/79474380395.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/76709573937.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jesavazigopoxuxosakab.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/63705997698.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/96883992024.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/namoraboruvigapore.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/90057012883.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/fowajapikunalawugaxazozur.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/3474503091.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/mefilinugaxagi.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/63877798546.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/36026538486.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f3921221---sofigelodarepofajabunaje.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3ftimq3qjkc220skd8r4rsi6s6/31061699039.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/zaroxisipujazabasaxu.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/29686337527.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/gedosomuwekaguni.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/kitekoku.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f788e9e891---vovagekex.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/malimikegevuwixomozi.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/74281364088.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/18147289661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=psiphon+ios+free+downloadPDF 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_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 16560 bytes
SHA-256: 49bcdb7adc78fa3a021fc72cd2ca2a54c4a9ebcaebd9e29a41bb29100763f853
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 10584 bytes
SHA-256: 7b7134cac211f4c5a70cf733672c46420af05a77c867e5e2f4a7f4a556283a7a

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