Malicious PDF — malware analysis report

Static analysis result for SHA-256 683f967a2239f181…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 10:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b971b84a2a883240d1071304a615212 SHA-1: 5d79d7fbae9b17e4aa203551797337bd1e21efcd SHA-256: 683f967a2239f181667aa3aefbfe71c89b9b1fefe340ce518788617a4ab3f998
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=whatsapp+not+showing+contacts PDF link annotation
    • https://cheesykeju.com/contents/files/xufirik.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/90738946317.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/47245556869.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/zoninenekupavus.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab94265d7---ziwobaxa.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vaniwenifaranaba.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/sisijerexuwupavarifuxu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/kujubalinunikipix.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/linop.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/5638655900.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zuzitukigoso.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/5448085764.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/81939436806.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/xizopikutojafomuratosow.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/tobuzosiwalefe.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/taxogupuroni.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131273b418f8---fogafewenemeloxutosejojex.pdfIn PDF document text
    • http://szm.hu/userfiles/file/zudejis.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/35788accc85fb25c22c294207e1e09ce/vokovajudepi.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/6161411698.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wiwesopozoguma.pdfIn PDF document text
    • http://huntland.hu/upload/file/26925307381.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/tojetelateburenasopo.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/42352236433.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10456 bytes
SHA-256: d63a179862e7ee7bbb11c2c730c42e739f65c6cbe1c10d88004b1d311a765af4
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 17672 bytes
SHA-256: b5c5f83aafc50948c93d47645c8a70387b1ecac83092f9696b0f5661f7ef80b6
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1