Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c7b114f5dea01f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 10:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66b3cc69901513ff521aeac65e72d818 SHA-1: 63705e00e873476c52c02878bdb585b52a26c1c7 SHA-256: a8c7b114f5dea01fc4224b1bc63cd4ab20cc59aec8ee450da7d16f608607cdcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

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.
  • 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://ketchas.ru/uplcv?utm_term=best+camera+app+for+custom+rom PDF link annotation
    • http://satcomlink.com/userData/board/file/tozavakupuj.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210909152540.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428142d58b9---3326725035.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/76611689976.pdfIn PDF document text
    • https://limsurempat.com/contents/files/tofifeper.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/dokoduselazivov.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/libaburivumijomof.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109110401325100.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/49519519262.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/sakitujopojuxezopikogad.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b2911b32c---kusegevipavilibipitetu.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/72180230200.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/63597178213.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/53513356969.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/tabujovisav.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8d162793---2100022321.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/mesowo.pdfIn PDF document text
    • http://wamer.org/userfiles/file/subonivajifutirepititiwa.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161381618a561c---89958419285.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/6157293323.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/35413661088.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_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 10552 bytes
SHA-256: dab2d354461bd6e71e3f8c07acc473ea868c408a6185a72c6fa2f69bb8417b55
font_02_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 18040 bytes
SHA-256: 1000ec718e44148d713624d5b5169affc05856006698f792c738238b9383a44d