Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab6f66427ec4aad…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 15:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b2da7b58c0812d8d87cb16d7609a64f SHA-1: 34bb1880241f23c623fc9e9025fb721f757c78f3 SHA-256: 3ab6f66427ec4aad62fd782044a8160af6c3ca42447049a3ce8a3a90e65c024e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for phishing or malware distribution. The presence of these links indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44768ea09---42786943923.pdf In PDF document text
    • https://mszukam.pl/dat//file/77883380343.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a7e9b47fec747c41ea1418fd62ec97f7/2828832100.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/retalewemuse.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7ff7e13ef0cb8ad6ae63e8e5d2494bfe/54618705364.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3690f3ada05bf0a17b7c4b8309133809/lebebejodo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210619_5E33CCDAD2DCCAD9.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/topirolegipebulomizet.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vunelusobiw.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/varosa.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb06aff38---63861600069.pdfIn PDF document text
    • http://meskerjager.nl/media/files/mosetazagoriro.pdfIn PDF document text
    • http://llux.vn/uploads/files/taxuralik.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/pofawamajitekopulitibej.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/69949692454.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98cbc6097---dixolelos.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/turumekome.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160896a839a758---99418228682.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/sevujobatuk.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/konetopilezawigexukugub.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7af734d2d---goveboponesosuviluvi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9024d2395---12066559020.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/f860hi626kvkdvm7a1meclkeer/46819372789.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c2ec2d9253---21497535477.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/renudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spanish+word+for+infinityPDF 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_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10692 bytes
SHA-256: 12b2ca2351cd91f288a0c51e502a3cd6c8e3576a077f1411616134200fea0adf
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 17116 bytes
SHA-256: d2aef203451e8c614d440e0d541183c9d6efa6aee351e2dcbf4b88537d50bcb8
font_02_sfnt_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1