Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6cefa5218585b3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 06:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e28e1eb8257bf3bc1152a9529fb2303 SHA-1: ef0d1dbfea8ad54761e4243f833c57ca920d154e SHA-256: 0b6cefa5218585b3d77bd9c77359d18f79f51f9860c9d687bac194a31e241010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=use+android+phone+as+speaker PDF link annotation
    • http://plafondchauffant.fr/img/user/file/pagefajapajalofowoko.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/24526020989.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/rilizofip.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/gamom.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/58466636858.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/varuzizasuwutavozi.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/jeronibor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447e9136aca---15491609575.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/8727987531.pdfIn PDF document text
    • https://123natura.com/stockages/files/duzaxavewitijabuxedi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4fa91318---xupewamafawonab.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/76777847194.pdfIn PDF document text
    • http://winso.tw/userfiles/file/99964653590.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/nuxepepiturukilokexe.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/40361477788.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/famipokobuwerokavigokowi.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/64862645270.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431e3607a10---14585273750.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/55710906835.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/20936571390.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/44271641191.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/4254947652.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/82160340375.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/jafofidelozo.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/39318228412.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_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 17620 bytes
SHA-256: ab6a8215d52d52074b20ba3b8a64288a8fccff809d4c4fa0853d4ef40d14a070
font_01_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 10444 bytes
SHA-256: 56cc3827b9f12bacd7c42ab0ef83fd5f35df70a247b8f535aa53280835e07014