Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f94912803a3571f…

MALICIOUS

PDF

88.5 KB Created: 2021-08-19 21:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: bba77ac52136d29dbbbb08c00a2775bc SHA-1: cdb5823e761e30008c76a8c37a16f4342670aa0c SHA-256: 5f94912803a3571fffe22f6ddbeb7b7181b0ac1e8c757ab6c040e882e34ee188
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting sites, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bomtvplus.com/data/board/file/20210519094828.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb7eabab5---68111801923.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/82091241072.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780c61c8e0---zitalufetowukix.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/wobugerogagapalowobob.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b58226102051d65df1eafba4d0d668fe/182797033.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9eb3af980---kuwiti.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878d292e1f---soxaxabokoxok.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/dafulenojudo.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/jorupejiwanoregaxipewin.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/26b0856e381d5fd8c68cb021e088a84d/90423429726.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/2634609719.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/ratifuvanatare.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///sejurokuvo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e48819bcc798efb51da1ceb87f9b12f/wasusutumagupibasuvarosiz.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/ripokanawoxut.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/wevurejinodadijefoz.pdfIn PDF document text
    • http://chayka-svg.ru/files/17911240510.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/16350e5c9c1516f56fbe9e67941213f8/wowobikaboxiguru.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/62728345875.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/50823511392.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210807012754.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609278f198195---98821429297.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210531113450742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dell+powermax+2000+spec+sheetPDF 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_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 16696 bytes
SHA-256: 22456028fce4ba543dff3d75ee0e2b2fc7b9be7e8736a65582f035f7cdce96e4
font_01_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 10876 bytes
SHA-256: 958aefa8177b43296b8d2948a4aedebb29592349e49f1bed9187c8441341ca54