Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbed3c00f1606fbc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 07:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e13d5e2ec936f26bce01e7995e3be3f1 SHA-1: b54589a283bae5b9966e3149a52bd332e4743510 SHA-256: cbed3c00f1606fbced716fa5779c9f631e51a1f58f0e5262e9cc82dc5ce1028c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness. Although no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ff5c2da6---zutikujuzoko.pdf In PDF document text
    • http://margheritango.it/userfiles/file/fojugibanerajulimerojene.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d51ed0a8---xoletejirusunawuz.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/zojenimoturawakabulef.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38f84a0a83---vezofizi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/pizegisof.pdfIn PDF document text
    • http://viorina-deko.com/images/file/68190805419.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2b23247af---88081222196.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rk369udobvkvpbl1alns8u1p0m/46234760935.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001ea8a58f4---74106610588.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086471e32309---suxode.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087931851315---komepo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/lelonizitewezifidiro.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/totibigigufekabi.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/wobagonokapaf.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/sifavagef.pdfIn PDF document text
    • http://saltyfeelings.com/userfiles/file/torojizesetawukanezibupi.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/55162096800.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/56872628925.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7742c05df621d912f00fba479f0ac9b8/91508283903.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xikipojek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+application+life+cycle+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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10540 bytes
SHA-256: 827763263553373e464a684a34697cce4431fdc039c67faa028c6d96e080a2c8
font_02_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 16748 bytes
SHA-256: d4044c729cf0c475621d68f4579e7b06e95afa8eaa6a37fa969a5ffc6d10f86b