Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fedaf3e09444fbe…

MALICIOUS

PDF

80.5 KB Created: 2021-08-16 07:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4c4ff66213d45070fd19467a4430d09 SHA-1: e2346526e7cbded0f428a72fbc33b5f54a90a8e6 SHA-256: 4fedaf3e09444fbe10bf72dc49ad44df1a9f7d8fdb883c5577366c6dcc71af13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://synerhu.ru/uplcv?utm_term=rick+ross+2020+free+mp3+download PDF link annotation
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/64a543ee97ce7a6d58170d4cce0e597a/doraxubazevejilugaxuboro.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/53080863753.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/91522842842.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/75135709227.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/07b6dd4962a18a24b402aa90c9d19af7/17195732707.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/5806822b77d1409332d6a535712db561/63047882566.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/28932448545.pdfIn PDF document text
    • https://domilot.com/uploader/files/wosarutezawumedizirugor.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/58604404049.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/timuvunuvipa.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/lidoge.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/11318948041.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/fogifepavipumukazopewebi.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/vupaxope.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/jagerawowa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6fb68e1f---8284754062.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060619120228.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbbed6275---bupilikipomixalurowiz.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a4314797f902f0d159c16ecd6112e3db/salebijibal.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d67ca3ad2b---23311109015.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/2122592740.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63808726243.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xupiwe.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_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 17808 bytes
SHA-256: 61f109ebc4aaa896fa864ca53dfa403c8df0e711d9d37f743ff762d1fb3e0b10
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 11320 bytes
SHA-256: deb14258b5e395a449ea383cdd593d16369e410135aecea322a423d712978bfd
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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