Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd24cb39358aff2…

MALICIOUS

PDF

74.1 KB Created: 2021-10-07 04:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ddd82113e1214e7d461c27a29834ae28 SHA-1: 9564eb6bbb4ff0959e4a5132fab62ffe0eab8ae5 SHA-256: 6dd24cb39358aff24644fe8c768e18ea3d453d17f3ab9f93d4a4efbcc1f75482
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Static analysis revealed that the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links are likely intended to host phishing content or distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://galantemontagnana.it/ckfinder/userfiles/files/gisidilusosepozosezitiwi.pdf In PDF document text
    • https://visualmotion.nl/uploads/file/29063317752.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/64362207200.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632743140.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/givib.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/4484258991.pdfIn PDF document text
    • http://aven.su/userfiles/file/sidakidotuzifotusadat.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/16733506821.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16153d7c84ce1c---16481498078.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042bab02c1---samulalezubitaxumo.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d9e654f7ef88ce1b3d160b05892592fd/rufinuzovademetifevib.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3he20idb7op3h8luu2jcb4odd7/dewumidafixifenagegeda.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/61319508215.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kuzugaliramedimolo.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/40220722204.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347df59b07e---wenozunemi.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vuzovivo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/pomowuzujisavutir.pdfIn PDF document text
    • https://dhesient.com/media/lupememadowata.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16135c737c0f84---82977093258.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/kagubabamodiro.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sewelepudo.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/tawejaweloguvadezur.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/nelokol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=7+other+recycling+symbolPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/fepakogaluwojugarusaxe.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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 18820 bytes
SHA-256: 31b43da1044c1a4180da06a0a14352ed72fcf8ae80d0ead71031cddfe4916f5f
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10720 bytes
SHA-256: 5a1a0d949b466654fc502091a1604a775d3d8f19f62ef4d01751e52bcad6e386