Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c3f1d66517473d…

MALICIOUS

PDF

106.2 KB Created: 2021-05-28 03:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2a3db0fee4fccc6fcd8066168b00b9f0 SHA-1: 58fcf94d925931b62d64fd604bc530bf065406ef SHA-256: a4c3f1d66517473d7cf3efbc023c26ea3fa548caaad77e18ee1f8091cec523d4
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for SEO poisoning or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flags this PDF as malicious, and the presence of embedded URLs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://elsekmont.eu/userfiles/file/dugopanotagat.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098d8f39b4c0---85427834471.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/94798241086.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v9jp3tje4780j80ukh6v6ac11g/mujupatatodaru.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/kepujodepetot.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r9o1dfov03bgp3of580hqhpde0/misadinajizefavamuwiduw.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/33912197818.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/246905405608951aaa6064.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2698a4e7e---63786794262.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jekozoxopetepegaka.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7fa29807---zujajevoxonisenavaruwokuw.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/th2okreedv3mjcelh5908hkc5t/buvab.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160744f15a791a---vifofakiwolofes.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609f17c82959d---dimixelex.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/da455c50b4333b65b20537ac2917602e/33807068987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=god+of+war+3+psp+game+file+downloadPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 5356 bytes
SHA-256: 62ec5d8146f1a8a4fc9ab3a71f5bca8abb46d7113b3e0de73ac609e22a0948a8
font_01_sfnt_off0001560f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560F 25196 bytes
SHA-256: 3d6a5bcb1570bb327891dec4d7a6c3c031900f5a9ea58394fc5c6f20c1814014
font_02_sfnt_off00018df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DF5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333