Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb94c15214b3d59…

MALICIOUS

PDF

88.7 KB Created: 2021-07-07 22:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c592d48a1959c6dad9508beba00abe9 SHA-1: 9036153ea175b4d2e7535e7d777d3b3bf9df8f90 SHA-256: 8eb94c15214b3d59ab46f69b0ee89d0c13754fbb744e747d84d0caea045f31cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique for distributing phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • 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://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0e769ddd---sovivirekerasu.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/51ff8a607f90bc54a67a74e1ff222141/16148617608.pdf
    • http://pnmanagementsolutions.in/uploads/87616435050.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f386dcb8fd6d28ff23a7edce98be3d21/33403327853.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bc1f50c2903723750acc87a68a8fe607/nuteboraji.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803f91db054---78051753484.pdf
    • http://poorclarescork.ie/images/kezomu.pdf
    • http://1hozain.ru/files/userfiles/files/38019867744.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6623c0bae---zukabuzo.pdf
    • http://rghsalumni.com/clients/82979/File/gitaxinuvuruzuzokugaj.pdf
    • http://gyobel.itpublic/file/48251015093.pdf
    • http://technoauto.jp/js/upload/files/12447262703.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58843bdaff---guseru.pdf
    • http://huucodatlanh.com/userfiles/file/gekedakotivetut.pdf
    • http://baigeleather.com/userfiles/file/zafiridasezajipezeworov.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/zezinabalosiz.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a046c690---26031111295.pdf
    • http://ingatlantv.tv/userfiles/files/43594466592.pdf
    • https://hostingalani.com/calisma2/files/uploads/jufafumexididosixi.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d4ed3473---10149197626.pdf
    • http://archerelectricsupply.com/userfiles/file/45907673927.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6b34a2f6---89514721863.pdf
    • http://ck-tct.ru/userfiles/file/34310228386.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/nu6lme25miblj8r3cpg4u9an34/wuvafa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=septum+and+a+nose+pin
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bcabd674d---lefuteresilusedodide.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e191.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 16792 bytes
font_01_sfnt_off0000f9a3.bin
7e98d54db984565d317cf211eb745f6efa4310ec131611390179dc0aeb0f5d00
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 17268 bytes
font_02_sfnt_off00012691.bin
544b29a585cff80b1cccb9a9416b5e1f6550ee1d22e6c812c5f0b0fa5537b6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 10584 bytes
font_03_sfnt_off00013eae.bin
6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 16384 bytes