Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a05e1bc3153be4c…

MALICIOUS

PDF

81.1 KB Created: 2021-10-16 16:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12a3e395cf1ef81a524d85394c258c64 SHA-1: b316afadeb15f31f78bfe72dc94c76c11d6027aa SHA-256: 3a05e1bc3153be4cb45645ca6f5c772177fc980f421915154bd73450849b80a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=lima+beans+and+okra PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec8c42bc6---mujuwamusoredog.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210903083256505.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tuiv8qgtqatluhsnbmurgooge0/dibavopakadudavetozazov.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/94335486816.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/33237388686.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cd81823bb4---duwulegavixokigijitoxinun.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/9752310670.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/80544537109.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/39743202436.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/xojekolivi.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/vifitag.pdfIn PDF document text
    • http://farmina.ru/uploads/files/39299782711.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/93430301402.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/691acqa0alrjemn592vmui9kq0/35926051345.pdfIn PDF document text
    • http://skupka23.ru/upload/m/pigawe.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/zosaperogugomapakakos.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/fitikevavojelopuro.pdfIn PDF document text
    • http://zenithmetals.com/files/42784439637.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/65755670960.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/fofirafege.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/99745609403.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/15887155588.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/2965004283.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/binego.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/welejele.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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10456 bytes
SHA-256: 3fb400dd255627af9a36707ae726e5092b985436224642eb674587062ec69863
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 17036 bytes
SHA-256: ed6425ca940274f720ce2daadf9221209483624fac162446dc72a48960dcb71a