Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b8a53eb163e4c…

MALICIOUS

PDF

90.8 KB Created: 2021-09-02 18:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 876107a24bef5d06bb9fb018ef075987 SHA-1: cf41cd1d58633789d0ba50f4db85de8be1e43de0 SHA-256: 8d4b8a53eb163e4ccdc07d086331fadd642252b97d00dbb9e5fc7590d9fc64fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://appfacile.it/file/luziwobubugofukijikiti.pdf In PDF document text
    • https://fivetc.net/uploads/files/88516810919.pdfIn PDF document text
    • https://vpmemorial.net/images/file/49027681039.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/32121786884.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/fa9vnodpakitm94ve1592c58ba/50550528802.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1930782a24198e148d659d2a4386a379/nonegemibezazorelot.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/65349902951.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db31bbc0d---11700006288.pdfIn PDF document text
    • http://www.celso.org/download/92253405211.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/34020914568.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/puredodabe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/soxowixotugexin.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2d1234573---7306003365.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3433924135f78407518fb2d6fba3f2cf/67440200545.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o0pdce5ugoq4v9lll6jlnmbnsa/39874581566.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/16076725167.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/rumupofurebelipoma.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/53083290783.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03db6c3f68---76838907983.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/muzofiratidofusegobesad.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/58540627637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=correlacion+lineal+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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10380 bytes
SHA-256: 4c80b5f9f234c1b477749466b49826a9b05e2b5f179800237b43a4139d5cd429
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 21908 bytes
SHA-256: 6aa776edbaf6ac50536ca1c8ef72013a34e658aeb166b69e82ebade573e2ea37
font_02_sfnt_off000145f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.