Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcab81115befe00d…

MALICIOUS

PDF

180.4 KB Created: 2021-08-18 22:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9665ef2d42e7525739d93037774375e SHA-1: cbac0b57ea6385ba660d50967aebbb2f4ad0df73 SHA-256: fcab81115befe00de6d0eae662481a2b5a4f035084374ae5bc9a0dcba8aa5ae5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. These links likely serve as a lure to direct users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=barron%27s+600+essential+words+for+the+ielts+pdf PDF link annotation
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210705043521.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/texinukopajevi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/43555630223.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca10222b7---lazaj.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d41a2c1c---86956985506.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rejipubuwu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/54579773025.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ec7321517b8bddc778f25316cb5b7a71/jexezeliwubaxivumosodet.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/23463378297.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/pomakebovobagerulep.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046737769ee---3854090515.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/94368738140.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/98669766135.pdfIn PDF document text
    • https://steammining.com/userfiles/file/vetekisapate.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/wudosa.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/zapimufusukezesilivuw.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e795c65be---xudoxekivazobagor.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/zomuwafexeremorokag.pdfIn PDF document text
    • http://indemo.pl/Image/files/winogumegexegap.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/xawinovakifexomo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/25261470583.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/54048184957.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kr6e3lmp8c2pb32cbaffh2vtng/vosojixunofakugugezavire.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_off00025192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000269a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x269A9 11060 bytes
SHA-256: 4981cebceeef2673c0610333a5a96b9e4f16471f3d7dafa24981f0406b3dc392
font_02_sfnt_off00028374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28374 30680 bytes
SHA-256: 8a5714e0974d5f51c15a3d3c7f3ae6be41d33300da9864aafd9f6a1c702c0305

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