Malicious PDF — malware analysis report

Static analysis result for SHA-256 760b4e48bd35f80a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 01:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 495f1bc8f236e3ba524a68fd72a95b4a SHA-1: 9438128c0b25170fb208a46e1980d8b60ca0f72f SHA-256: 760b4e48bd35f80a4bc9bb41347b9e39c06cc3fbf4758fa3bcedd23fb15a9f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/92plfocka5jglfmboe50oh320v/49219555095.pdf In PDF document text
    • http://asvpp.fr/pdf/kagukewafes.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lolizuwefarudufuwo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/36373135602.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c07f2fed4---dotevikonowunowera.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5e4a15044058fe07fc563f8114525063/gukosiwe.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/28565365507.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/zubufa.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/46305264874.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/13061368705.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/76423208315.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/dapumeveribagipikujiko.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/27527735863.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/supufanubofe.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/toviwamisow.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/28552406570.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0c727e01acbda3d07cc6df4b48b7d896/62168319314.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834af2c5f81---96769277369.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/27925722224.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/nurupubavexelub.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/sebakanupobotavenupegiwiw.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/jexojinugoxed.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e578215a---24744110436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pre+suit+notice+letter+pdfPDF 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_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 17860 bytes
SHA-256: 12d851d7f85b6c8d95011e82627cb9a7a50f6251a7c970089ab05ecfaaad2b35
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10552 bytes
SHA-256: 0eb3c7f5d131606311f0aee740588f3e6bbf893656724f977a9c41dcb7afd3fe
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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