Malicious PDF — malware analysis report

Static analysis result for SHA-256 922ee3e59425fa90…

MALICIOUS

PDF

68.0 KB Created: 2021-05-28 18:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60b62cdaf631069ff9cb61e3382020b3 SHA-1: 76cc46631186dfb1df36d43cc0289522d30e5db0 SHA-256: 922ee3e59425fa9018aa544be7b4ea59927d23849d8e51d85ff2631fb283430a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery, aligning with the 'link farm' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160982b6e1b080---lozekoxilepetavegufo.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a6ca5841---10991548830.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a06545d1a87---tugifesuxaduwofavilirorit.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c71b4eec---89924860878.pdf
    • http://adamlegal.com/userfiles/file/79126985481.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df1c6710bb---82916309513.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16220166584956.pdf
    • http://allmedicus.com/userfiles/file/lazumokafoleki.pdf
    • http://scro.ru/pic/file/fekodop.pdf
    • http://eperon-kochersberg.com/img_db/76562022540.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2f38c3d721de5b8e01f82a144c95ac7/14033474338.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090796c1f544---87505325663.pdf
    • https://susta.vn/userfiles/file/salajifuxanitebo.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609243405376b---81106963835.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc27d8d0be---42817437629.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8c9e0c151---fejemim.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b356c78e4b---zataligiwurasumepusetite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=spirou+et+fantasio+pdf+vk
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d177.bin
ed75c14ace2b2d3da6e76d308af6836ed1e3d807ae331136fd69debf4baa11e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 5232 bytes
font_01_sfnt_off0000e35a.bin
e5c553372fbc8b0b565fda297d13d2f7f2da55cc813a42445e26b767df51c377		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 12144 bytes

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