Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d463b32d3af449…

MALICIOUS

PDF

108.1 KB Created: 2021-09-06 04:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f7e51913893886ec855c62c85cd65696 SHA-1: fc4e8aab106f7917de7814dc51a5a7ed843fe42d SHA-256: 52d463b32d3af44969276b3643bd05d2b87c51d80719d2d35e053420722fd2b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be distributing malware or conducting phishing attacks by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/616006644966e5450f0c1cfa0a8b9b24/77513545953.pdf In PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/fukigezejegukogijetatidil.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/bugusezafi.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/5977600406.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nijexowasudifunageg.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/duluvolaziliketekogifeb.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pinuzoneluletuporolukewom.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/fibalinunemeko.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c496f501d25---kosovigezawedor.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7613bfe8345b252208eb7d46f2dffb1c/pokuxar.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/pefizesutobet.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f3e8507326be3a7cb0fc539cd66650f8/23607278542.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/samolo.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/38143245481.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa9ded95a---vofufupusilibijawuwuba.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/zexamawa.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/pikurudutida.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/levoxuwerux.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vejedabawenoz.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f5aef244c30c5e84618e86e6d940c38d/butugitifedumufipudolonim.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/vitobejipumokoge.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bibuxaninarebemiwa.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/wufojapenugujesavokaseku.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/gogezavozefelikow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=organisational+behaviour+pdf+notesPDF 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_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 19356 bytes
SHA-256: 8363fe895f9430125ed77e7eb166397733122f8fa8ef4bb27607feebcb10e1ff
font_01_sfnt_off00017094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188AB 11108 bytes
SHA-256: 986a5ea3602af73bb621c1b9c8fd695684cbf68f812c26a6f5ea588ec82cca72

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