Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bca8b41a92b575f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 13:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 116b4eebfdffb800654db7ff5fe9a9dc SHA-1: c460a1d54d10746d958b2b35480de916482f1f49 SHA-256: 0bca8b41a92b575f73b8bd3c08dfe3b5d759acef1913347d2c0245a44ebb6966
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and other potentially malicious domains. These links likely serve to redirect users to phishing sites or download further malware, indicating a multi-stage attack. The presence of embedded JavaScript (T1059.007) strongly suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134abd626bb5---gokemorowumo.pdf In PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82003917430.pdfIn PDF document text
    • http://devveb.net/userfiles/file/5234478844.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rivu1056jt0vtmqki7iq90b377/xevoxoralifugokamakotu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/rizopebaxesu.pdfIn PDF document text
    • http://dejede.com/userfiles/file/gutitokowidisufasusubabu.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/21855860712.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/9446413584.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/nenikenifonafubafomivowi.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/49121917421.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/83101003403.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/dirulamezuj.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/vovirobemawuxutamugirug.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/loverowiduvemoboxe.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/jetujasaragex.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/pixemape.pdfIn PDF document text
    • http://hidramaco.com/files/files/66155653137.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398e9523c21---rinumaravitev.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/43778765812.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/14153619334.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/bexanenobemisu.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/59703420362.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901142204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=buscar+telefono+perdido+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_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 19056 bytes
SHA-256: 604ba4933e7b316fe717f8166b18086dc72b3079e38e707b39dd2adc38e13b60
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 10764 bytes
SHA-256: 0b602ac67d9350e5f4e5841da6a8fa5d56dba11087b3d9525947d705cfcac3ba

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