Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ade23b2584ab3e8…

MALICIOUS

PDF

72.4 KB Created: 2021-10-03 13:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed9ed834b9a2aa8b21717dc1b3997ef0 SHA-1: 059908d16c2174abecc2dd9066b21b5d58f1447c SHA-256: 6ade23b2584ab3e8703cae48a720aed0f0b153e389a823b627453a697d518f6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://medvor.ru/uplcv?utm_term=sociology+references+pdf PDF link annotation
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce6807431dd3b8c0ec251d0b46e2a514/sudijopugesunukabel.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/88309886430.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/beropelom.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/besirukewijok.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/42535184506.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/jakozabiru.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/52462517222.pdfIn PDF document text
    • http://telecycling.org/files/file/40407380750.pdfIn PDF document text
    • http://hankaebertova.cz/userfiles/file/16606102840.pdfIn PDF document text
    • http://wdnederland.nl/file/mobazudamadojejep.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbb571c309---92678564476.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/71213947746.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/15406782157.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/62819232245.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/xubakibazeveno.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/66913120039.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161585943bfaa5---59159017251.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/betekenejaxazani.pdfIn PDF document text
    • http://domuran.pl/files/file/gesefuremebexepana.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40134683239.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/logefenirekoborux.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/32169979349.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/68822563224.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/55563154783.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/98808138729.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905123805.pdfIn PDF document text
    • 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_off0000b717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 17296 bytes
SHA-256: e17e1164b94852dcf831dce3b059ceb5dd7db8b4e702e094b7a6957845191cf7
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 10724 bytes
SHA-256: c8b93dde431cbb10cf79df8a0e5fa932adeb951bfc893de68f5469bf8b3ae40f

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