Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c5ef0566c69148…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 00:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dd5d56d104490efb1e8a6d01822d94f SHA-1: 9efd4b4f957fee84a92df8b09184f6994c58fec6 SHA-256: 39c5ef0566c6914831b036d607938421fc0f61ec1f883a93c1b560ef67f1131a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. The heuristics indicate that this JavaScript is likely used to redirect to a link farm hosted on compromised WordPress sites, a pattern often associated with phishing or malware distribution. The ClamAV detection and ML classifier further support the malicious nature of this file.

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c200dc0a6---ragobeso.pdf In PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/sagivo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b566568b8e---xezufijejopizebuxavon.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/fejopobizenugaju.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b1305ad7364c9ec672e15f9928cb604f/28379179443.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/wixiwajubunasifirosureziw.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/78327962813.pdfIn PDF document text
    • http://zeci.nl/im/image/nogidanumowakukokop.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/86797418331.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62694734257.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/19167634666.pdfIn PDF document text
    • https://brakos.it/file/levezesotijolezolor.pdfIn PDF document text
    • https://yasacompany.com/upload/files/muzebotunijoguvutibububo.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/lufifilojelifoxisogazi.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/53398195910.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/51086920842.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/28704985274.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/zemubipegawutowojudodow.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/34957012961.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/25752577402.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c904a15ff3---71285445616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+episode+1+freePDF 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_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10768 bytes
SHA-256: 1d2a9fade14dbd93b273153b9bc3d97245301c8a6fc890da1717a1c31d1205bb
font_02_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 20116 bytes
SHA-256: 4d5a84418cbae865a0c0a5427d45be8ca30292d3d9fecea6d5f4159a6c8a60f4

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