Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58911c6bd3ff046…

MALICIOUS

PDF

84.7 KB Created: 2021-07-19 08:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2d2a00f5e057cfbb40ade7e519170fc SHA-1: 65ff4113646c32f91216f51ea3ca9f3a10150c4e SHA-256: e58911c6bd3ff04680daf70b008e8e5c71eb5eee0539b731d57a837d1f96a007
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and is part of a link farm hosted on compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to obscure the final malicious destination, likely a phishing page or malware download. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://mosjob.ru/images/file/85974027984.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/klis3o54eu2aju6cfo7tnp2sem/94442754702.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/32097820392.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/cacdb191264fb878de3e0af01ea35e5b/wanapizuvapoxeradugirax.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78033858717.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/39315118136.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/nojuviba.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/52971971339.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739c98d6308---68104552272.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e04e9741b---rofixobumuboxaxe.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d382ea05ce7cf7524dbf4fbd74f47753/78828323764.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/10919750564.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rmbam7mio07jkiuosdodudr9f8/gepurewufowabu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qt0bgkav3883pjckv94ufoofa6/zetame.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a83c64c2---96356397555.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/50485303291.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/ditubi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/984803dc10229ce4edcb8bf30d632536/33832358328.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071365e4c620---ginekef.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/55892445557.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b487bab3a---sapop.pdfIn PDF document text
    • https://tckontrola.hr/files/93958798389.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08d747da5---kenezipodajemok.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mmdqqcviiu9hjdr714mhmhl3tg/82936671226.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/qrlhh5hr1199jsd2qjlm61v5dg/72094786233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=phenomenological+research+methodPDF 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://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_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 16660 bytes
SHA-256: addf4df24d3b433956895cfe9af660f570e1327cac86485e752f132744fedea8
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 10816 bytes
SHA-256: c51e1461a2055597c518a209cf382e6c8bac572534513b563ed21c128c14a973
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.