Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73dd072f8084536…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 12:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9ebc77aafa1525f9f86f0acfcf516f1 SHA-1: b0f94d3d21b30c2723ad49d12d65c82cacd87bc0 SHA-256: c73dd072f808453607ba57e671dbe90004ef082b9c545e4b40e462379c603445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=new+minecraft+version+apk PDF link annotation
    • https://pensiuneavalentina.ro/app/webroot/file/gugipir.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/mobomefadezegenule.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/lifopodijezepewawanela.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613141a9b0cfb---nizalikasakelebo.pdfIn PDF document text
    • http://bakoca.hu/files/file/jegakuzowogokide.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59538405267.pdfIn PDF document text
    • http://eternaseguros.net/files/files/fojigiroziv.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192030168856.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nedotivef.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dbc04ff3aab23fa12da34b5521705839/30388981588.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/monixali.pdfIn PDF document text
    • http://hanifeugur.com/image/files/85852813338.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/30231414791.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/36338159415.pdfIn PDF document text
    • https://vleek.com/uploads/files/87469769696.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/12439671123.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/kegedenikir.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/dutatixok.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b92e6e6fd---wopewikakujiwe.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufig.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/fujegekunejemew.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/gamajugavimaxopusujevosox.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/99115937037.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/44310571206.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/bekilabumavod.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/dapaseda.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/6950476753.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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10816 bytes
SHA-256: 555b0dc66a987dc3f456cd564116db12646e2e9a2f8694cac6ac44e212d4f9b6
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 17872 bytes
SHA-256: 02c414ecbba56928ebdd8b1d0dc9a30964c9db0bc45541663460f1d18dc4a2e4
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1