Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ed8a3bbe2b59a7…

MALICIOUS

PDF

100.2 KB Created: 2021-09-17 23:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 581331374d79b23ab0f24753ae45207e SHA-1: f0ff24fceb1a7702539e36971eb60e55520ea70d SHA-256: d5ed8a3bbe2b59a7885749e3b48d4a1885242d204070ec6b0ed21e6e7437d6b4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to obfuscate the malicious intent or to initiate further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9nm19546sk75dead6c0bc3mff5/fakusojimovemujavazizet.pdf In PDF document text
    • https://songhongresort.com/img/files/1881482352.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/sakapi.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/35698674997.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/21755170584.pdfIn PDF document text
    • https://banghenails.com/upload/file/lovotodoriwavobiw.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/putufezuteriribogo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15b51da44---vepovezolulipuj.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/solapotilawefez.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c22ddf1baa---deviwebapo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cdc54bd6a0fc0d9b58e5a0668f890d27/damusanazepel.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vosezigikizizudesagas.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/xeniza.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/64040877425.pdfIn PDF document text
    • http://strahyi.ru/images/file/sodofow.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/wugakasezule.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1dcaf1b8ef90f479f7a08d370f44f680/28858403845.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/metogamosonena.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xeweviripimigowawupodu.pdfIn PDF document text
    • https://atavio.ru/files/file/72739474210.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/modavuvipazagizobavan.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/46401360672.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/39494854079.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/15085536388.pdfIn PDF document text
    • http://zzquansu.cn/d/files/matexolijagusakix.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfef3a127---nesomomogukerilomuvubag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spider+man+homecoming+full+movie+watch+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 18020 bytes
SHA-256: 7b1eb3cb3fb7a447f08c4630425de9ce6f9b02566ef23281dbc20e01b5e73f5b
font_01_sfnt_off0001350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350E 11224 bytes
SHA-256: 8cbc72c0bf63669ffd1f6691169051db44413996a4042265390c3623e8df43c1
font_02_sfnt_off00014efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001670b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670B 17724 bytes
SHA-256: f872f19a49739194f1d250e108d0f7588b10904dd1d0176915cd0ba422e81560

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