Malicious PDF — malware analysis report

Static analysis result for SHA-256 b805ce020289ec2c…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 16:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3515d509a3705c311c37e7a4ac200f21 SHA-1: 86e49677d56eac8a4e836408922fdc88bca27aff SHA-256: b805ce020289ec2ce68affac62d0ebfd5b073f31553e896e1ec097c3fe57714c
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and the presence of multiple external links indicate an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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 http://juha.be/_files/file/24374493438.pdf In PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/89089968910.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/26403229662.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/69657559337.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/37811708424.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/refepidusujesawimub.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/gewagatuwakugotep.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/26696465935.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/gijur.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161534177b18cc---87119821314.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/nepolebuvuvudabibixevo.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/garisugalomufurep.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/69583052003.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/9864722170.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/telasolemuxajosobazarow.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/22284201403.pdfIn PDF document text
    • http://www.polni.si/Images/files/27398150195.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/29967649930.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/46205574802.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9s5kgrtn3scmj9qccsburc435r/67953339094.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/8971598679.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fb00d0b532f8769477d40dd8e9e61a83/danexidapatigi.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/37489127398.pdfIn PDF document text
    • http://rentaruedas.com/files/others/97190166986.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/xitorusofevud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=confidence+interval+for+population+meanPDF 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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 10812 bytes
SHA-256: 4c13a9b859096f22a5393758bd79e06e003a212091b88469fd77c62bf9a6404a
font_01_sfnt_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 15120 bytes
SHA-256: 2a92fd05a8d0fa6b17caf4299244bba8264cf91e26ff590d46ace90f7b13d063
font_02_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1