Malicious PDF — malware analysis report

Static analysis result for SHA-256 40248b5b42aacd7f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 10:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcc08184e8952023f9eec3f245005b87 SHA-1: 9c7b6946206b74fbcdd90be90070d2e5482bc375 SHA-256: 40248b5b42aacd7f3f879339fe588f59aa774f13bac100dda4356cc8e94c0eb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://files.ibiza-ferien.de/file/sazabizozix.pdf In PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/20467682046.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/minosejokaxode.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/bodiwuwabuk.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/nusefewagetikenibog.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8be3883d9---21300689597.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/24151284963.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/xawugepukegobonabokiv.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/18414967209.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebd504348e---razubosi.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/kijamikebozovifebom.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914165425498731.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/57800134793.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/81191795230.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/tidivasefowepovevituzi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1fb8e3094---josupaxuzodojobimosagabud.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/62579815631.pdfIn PDF document text
    • https://partetesal.ir/data/file/64425912687.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/18206262529.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jobuxabamulile.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/bivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=life+is+strange+apk+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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 15388 bytes
SHA-256: 5e30f3cd387920bc77346dc9fdf7f12f4fef14e2507cedbe0f0d65c907bf29e9
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 10676 bytes
SHA-256: 0ca018c89d6a5084c04750a9d2f549cdad3dffc2d33ff89c57260633aad7426a
font_02_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1