Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcd92f2779a0ee9…

MALICIOUS

PDF

93.5 KB Created: 2021-09-11 22:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4823f33e44bae052dda1fc59e77e651 SHA-1: 1f4bb75f36fa0a9af23ae8c422623883208acc49 SHA-256: 0bcd92f2779a0ee950487538f87c6371eeefb15a58473984235ba3ac7f3a4d66
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=medicine+books+for+mbbs+pdf+free+download PDF link annotation
    • http://manenshop.com/upload/files/zisupuduk.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/86909473932.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/kajutidinatusimexovoji.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/80197799906.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/6541396894.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/xolezifulufuselutaputo.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/ditavudeto.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613112fa871a7---pugulu.pdfIn PDF document text
    • http://101balkon.ru/upload/files/81587871028.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c9c0aeadee8a05071602f8ca298ea40b/75849696918.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/10243073883.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/6109989005.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb34983db8---50108991259.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wexilovowuxizevos.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/81061396387.pdfIn PDF document text
    • http://poultech.net/d/files/tosekizi.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/wuzosanawigowu.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wewosujijijipisimojofebo.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/suwojewoguzomire.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bdcca3cc2---11632731639.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/pagelikixesikoxafu.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/degorovo.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/bixubekuleso.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/93979339193.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_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 10992 bytes
SHA-256: 00b5deef9e4aed08b942c72dd897d2a394b84f94d19ee108c86ad669df92795a
font_02_sfnt_off0001369d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369D 18956 bytes
SHA-256: cc17415d82058c081ba0a5293c9d6aea9b5e00963bf554c1e0bac389ae319ba7

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