Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba76a435fdf9232…

MALICIOUS

PDF

88.4 KB Created: 2021-08-14 14:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9394d7f2e94d57f705751ecbbd8db57e SHA-1: f211535cb138ca1358e49cf8ce8fdb8e2d4f509e SHA-256: 6ba76a435fdf923227dfa6519041cdafb05d944577eb520a391210fc5afec3c1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed here, is a common vector for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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 https://balaji-technology.com/userfiles/file/57280580597.pdf In PDF document text
    • http://ecohort.com/userfiles/files/zajinafekuwoburudefew.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/un85r4oja8nrlmo19rhlfoa2p2/weniz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b672493fcf---80906345356.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/valetagoduzulewanale.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/5adefvmg7ncfsns31ii0bi7bc6/seretigu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a711ecdc72---25813782948.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/58380687200.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/99971043769.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/52708801443.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202171232628.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/8522221758.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/77378344035.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/01836e6af47a21abff4d7c8c1015c4c3/jejunol.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/asphgi140k4eips777bsutdg99/jevafepidemosavovo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/5544010284.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/wogezinapodizumerum.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/8559872590.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/49486142411.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pisosunifajevupaxabobupit.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/rerexenojexelixupuwuzeb.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113493f8ad48---32427537161.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/404631872c1f63ecf86a9f2f773325ba/24812789095.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/87884227881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=icao+vfr+flight+plan+examplePDF 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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 17540 bytes
SHA-256: 4a8c023fc423c930aceb617a3ec85114e92481ce18f71b13d96dbc82e936bf07
font_01_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 10876 bytes
SHA-256: e554be72b5a9af26117b26abc3e47bd296fd1e5f866de16ee6a4af542daa37dc
font_02_sfnt_off00013b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1