Malicious PDF — malware analysis report

Static analysis result for SHA-256 c765ee420fb97beb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 13:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8fb50c7086592e8a71f8e7b410de49f SHA-1: ed380181d9118af7b6a22466d0dc591a1160d230 SHA-256: c765ee420fb97beb47c1ba482dde9a16d30aa190f6b9aa2c93b2d0259abf9920
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mopron.ru/upload/files/xasowa.pdf In PDF document text
    • https://buyafranchise.org/files/files/zomuxukenanifatupowavi.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/potetepugabaruwunog.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/javojepukuwukoviviwede.pdfIn PDF document text
    • https://loctra.net/userfiles/file/19032012076.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/mupizitutiliguv.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zevenedetuler.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/82239290563.pdfIn PDF document text
    • http://capital96.com/userfiles/file/80194698154.pdfIn PDF document text
    • https://morabia.fi/images/file/kipevopitomoropeduk.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3d266684---kabexakemadejutavub.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fikefowuletimizotikigax.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d95a49b33---72609246613.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/tifedanuzagesowifukiroto.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/47160108.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168627f31d3---suwadopubematewipelapak.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/fowubipuraji.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ba4c3b96---likeg.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/19895682716.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zijoranosuzotivowefujaro.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/bazuraxe.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/94429090910.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/50791741597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=football+special+teams+playbook+pdfPDF 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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 10900 bytes
SHA-256: a13a0f61a826edc6d84ceda932d2d537b3486f40463d34b8c42ef847a6e610f9
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 18320 bytes
SHA-256: 40cc3be7ca7cf70dc9e8c47f72ec15f84eeca80d599caac92edae8e3ff26803c
font_02_sfnt_off00013143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1