Malicious PDF — malware analysis report

Static analysis result for SHA-256 682eaa1b911d144a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 12:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b45bf02771cd7fd5a60fdb8c2d16015 SHA-1: f7b7a562f22435ba65257e98ca6d4198c022b60d SHA-256: 682eaa1b911d144a39b18c6c19e94a4134a7ce38fa81fad4153b824fdf8c1e0b
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. Heuristics indicate a link farm strategy, with the primary goal appearing to be directing users to other malicious PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bularz-auto.pl/images/userfiles/file/winiduwag.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7cc944c6---8253677371.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aun1nbfhv72p2nnhvdopl2ocv1/nitivowusevuxapuditer.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/90465757557.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109031029526062.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/zoraxabefajagazigod.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5fd76678---ruworajigidawajodupaz.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/buxotowepabujorotukez.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/rapekogipadakifolasefaj.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/83666442110.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/80519164459.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/dofirezom.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a3cf5d6---93533062412.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/wibitedurolebetimenuketa.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/jajasigubi.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109140032236837.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614309d436069---wukekirinuw.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210914170728.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0161434---91166210959.pdfIn PDF document text
    • http://lovesenergy.nl/file/94368740936.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/85550713641.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/42552081560.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/ximof.pdfIn PDF document text
    • http://njchemland.com/upload/files/tuvejovazokamumopem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hacker+live+wallpaper+downloadPDF 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_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 10476 bytes
SHA-256: f02ee94ce04fb742051aa4bf285505de69f87397ecde3075c2f8fa8ca9f9c81f
font_01_sfnt_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 16468 bytes
SHA-256: 6cdc9d02388269aa82b291e6874332ec94fa148abab276ea34a88d02cc71d920
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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