Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3683ae4c550c227…

MALICIOUS

PDF

74.2 KB Created: 2021-09-28 14:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af781e1b2a6e65aaa3d78b2d74ccba99 SHA-1: 9c0470cca7b8ab093b5b9d7fa55a0d18420ef5d2 SHA-256: b3683ae4c550c22788a2127e47d0c66dc650ff7541f062ee868795b3f44ef999
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nisorodamomowek.pdf In PDF document text
    • http://kingkady.com/uploadfile/files/14573055012.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/20838110354.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0eaba6daa---lememufe.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/48393307377.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tenonirogevabutinusup.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615273d21710f---rutatotixedalig.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/vituvazadefowujugarebowuw.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/83788060594.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/89174358088.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/81000225834.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/37082239121.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/vawejufomagazamev.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/71981442233.pdfIn PDF document text
    • http://xfswchem.com/upload/files/58407905557.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313089edcc1---456444678.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pilejivewopizu.pdfIn PDF document text
    • http://cobmedia.hu/include/zawapaga.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/litutexitexorirafomexari.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/86852527992.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/jezototudipaximirona.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/13649653399.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/kefofarawowotuwubep.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/33067898304.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/sigefejibomudoletogegis.pdfIn PDF document text
    • https://schmitz.cz/res/file/vedar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=counter+strike+online+hackPDF 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_off0000bad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD5 18540 bytes
SHA-256: ea455f6fba4f1dc1f18cb5e6c4cfb7b6548eb0a45d8087d6e6b69202f8d3745e
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 10552 bytes
SHA-256: 2900ff9cf6261bdb754c78944ca4caea8b411d3f8a5cbf264dde261a4df7fb65