Malicious PDF — malware analysis report

Static analysis result for SHA-256 2829714944d979f7…

MALICIOUS

PDF

65.3 KB Created: 2021-06-23 05:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0798ccd5c9823ee2a5a17532ae25ea2 SHA-1: 71eb5a89b40b380da014da6039a3ca21578ebca3 SHA-256: 2829714944d979f7e80048f155fa9cb74da5d97a3009b6e0e68b4daa41110a6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160711b2839c31---bivemilirobil.pdf
    • http://zkojicin.cz/userfiles/file/87550282569.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/tonibiriruponeluris.pdf
    • https://annjulieskarpmo.com/userfiles/file/zemasop.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28180631179.pdf
    • https://kodcomputers.ro/2664/uploads/gumemagutegonajumawemes.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5a6ea634---73893839910.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rlf4r57uukapc759alrvgmaacb/72707044477.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/117d47804466a52a40d4de2ec77aa81a/fitiv.pdf
    • https://afra24.com/basefile/afra24/files/87396737420.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db5bf890f1---27074338292.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c535e8a44e3---11749346736.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877527c3a0c---fudopefojogimofevazonet.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/85531a5e281563b4cb3cd595e98cd840/faniwuledogemuga.pdf
    • http://phuocthuan.vn/images/pic/file/99300669883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=mp3lio+video+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b75b.bin
dd126a2e856459a9c9310eea9e8eaa07c22b29afe1606938843eacca873f280f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 4708 bytes
font_01_sfnt_off0000c77d.bin
af4b7a4076602a10f408c3e6b0da7ea27e493252c7babd5a906ace64d881bfa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC77D 10192 bytes
font_02_sfnt_off0000ea69.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 4324 bytes