Malicious PDF — malware analysis report

Static analysis result for SHA-256 5827ec141603dc60…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 07:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 141f584a6104bc9b5e7e9d4293c1a656 SHA-1: 0a9c13d3ba351498fa3a13b64a4f1f165a07f80b SHA-256: 5827ec141603dc603b13b6024f2fcecfde1f7f5abe13d58a86cbfc2d3fbceaac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lasantitosrestaurant.com/userfiles/file/85978660826.pdf In PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/dizubolenuzolumi.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vekaravirotajekivuban.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/romuxi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acaed42289---58077249272.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/181455078461334f9eafd46.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/kusojafipiwexi.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/33796896426.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/tojikosebub.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/90377458466.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137824074402---53965045169.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/bizurusupegidetofuko.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/97104876166.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/99862590283.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/82303162406.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nusifatasosidol.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394a27b858---48469393118.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/97999169872.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142abaf66a40---70439707563.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/netasijit.pdfIn PDF document text
    • https://suruburi.net/mm/file/lijupeb.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/guzonoxipijo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/dofabuvosenevudiva.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/65146146723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sex+games+download+for+androidPDF 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_off0000b37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37B 10860 bytes
SHA-256: 0279e52032c4f5ed4781029e14ed1f2032341434ea664979e5a0750b25557b73
font_01_sfnt_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 14976 bytes
SHA-256: e931323d5534081166a964d588c77de16acf925cc0cec23eb0d33001594fb3bb
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1