Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9119e806ed01553…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 17:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31b38e8cfed027f81b5fc0064e32770c SHA-1: 9849411aa9d68f8a2d3e3162cd47b01d016dade3 SHA-256: a9119e806ed01553d88219e630e0243e8f26410c877d43bb33382f381bd752ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://wastran.ru/uplcv?utm_term=what+is+otg+connection+in+mobile PDF link annotation
    • https://hssanesteban.cl/files/66594646515.pdfIn PDF document text
    • https://satesayap.com/contents/files/75604986883.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/76482813161.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/20961418.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/dimafupexe.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/71290268080.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/lazusasezusopipo.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/45468872947.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/pilonobikifoborapononimow.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/42675043311.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vopokasiliwetewupol.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/kunuwebixizanene.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/81762778373.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16138734a9844e---degugupepojajosulo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/425a4a3a7c73d2503e644ba60a2cf14e/besujasep.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/65209953842.pdfIn PDF document text
    • https://andana.us/files/files/22501822203.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/43958322021.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/42321664956.pdfIn PDF document text
    • http://mrybalko.ru/files/wozedowegoberil.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/29886740526.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/63137639914.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/wiwixolamijovasugoduxibi.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/jawiralovigivox.pdfIn PDF document text
    • https://desco.scp.hr/files/zonora.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/60195740743.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a7ea61dd---niwofipazigerafipudakuxo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6324bb6f4---57805896532.pdfIn PDF document text
    • 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_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 10712 bytes
SHA-256: 3ae4de750f24d4a83e0688670eb46fbe616cfcc3992c6b4533fb71e73b9d2764
font_01_sfnt_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 16756 bytes
SHA-256: d3322d3bf96150c0cfe92c6dd13e2f975440ce3f85dc35cd849fdf84add0a391
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1