Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf836e1828536d5…

MALICIOUS

PDF

75.7 KB Created: 2021-08-13 12:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b43a659ceb478afc36ed7ac7b9ae697d SHA-1: 027f125408926d631379c3f03c3ea9a8de7d809f SHA-256: bcf836e1828536d5132241610b23c20a952e18bbbc579e5009c964bcfb835070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/i54j0bmsl5g158s24ffivi9a0e/givubijif.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f96f1acec---32595813500.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3dlqi553v7uomfafsac9ps57nd/xuzedokixe.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/suzuvurubadatob.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/44548951924.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wovexuxibakejosetez.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91844910819.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160890a2dd9971---defileziki.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210606074437.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/wiwotirofinizo.pdfIn PDF document text
    • http://rurisnet.org/images/file/tosibobulukenune.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/89991800158.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/qbdforgabesqmlp6bfomfvaja6/12222637898.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073203d4efed---34851200146.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/vesapuwonixefewuluzen.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/92652354781.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/42757737709.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/jomusowaguwipesalebikuvur.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/gimezaratum.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kifok.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/tukotulumuvafulij.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/00058fd174365c987dc1c6dc72f1facf/kowegalizajib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=el+hombre+m%C3%A1s+rico+de+babilonia+pdf+google+drivePDF 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_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 11336 bytes
SHA-256: fb566e901fc238c39d81246f480713a5790e732bf0e41adc6b6f67862f68f88c
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 16972 bytes
SHA-256: a4a00e027d5713ac62020b34d31a15b7aa1a25dc313b281260dfcf88c23eeed0

Open this report in the interactive analyzer, or submit your own file for analysis.