Malicious PDF — malware analysis report

Static analysis result for SHA-256 e382f0a4e7ced015…

MALICIOUS

PDF

72.4 KB Created: 2021-07-03 21:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 83e6cc121d52f761aac202433f01cc5a SHA-1: bca6f782540bc807a2a71914ff4699bc8abe1617 SHA-256: e382f0a4e7ced0158ea2d3423c18d69ae74a3d588168858d34093660cb777a98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the document is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa6bd15b4f214eaddf59d20e2eba2869/74539500498.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607436cc4467c---gaxuwisatove.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88c45c569---27057496100.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/nomokuwogariv.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/11879146675.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/66583143077.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a23ad1da91700ca0f2e7c03e7c4965e0/wozudunilezanuzonibitidir.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/97628878458.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/352dc3a536c1305a32546ea2c13140b8/wuvujevirixibogebi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/adb96d835d0f5ed4d2adcb8b24b6f741/97407579526.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jugunuwo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jfstr6835sg6iqkgkqh8nqab7b/jirinipimibunuv.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608df702e9099---womumifonatigifo.pdfIn PDF document text
    • https://maisonforville.be/documents/file/16718548725.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d23db0c5b44---95584937022.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/lapozuwomitos.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7f3e314877ee693495174f081a291df4/23157919443.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/69335093713.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e883c7c065---wujidobegaliwulilutujexix.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e3214d3567aeb728c804192668059e3e/5103563933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=an+introduction+to+the+theory+of+groups+rotman+solutionsPDF 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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 16032 bytes
SHA-256: dee8f19a7ecd15a8a5ed17daaafb8a068fb3b8bce86d205f26a745d35ea1ee71
font_02_sfnt_off0000f865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 11260 bytes
SHA-256: 8faa40fca0704f01ce60e034935bd9a429a9c202ac36ca49f3859e582957b663

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