Malicious PDF — malware analysis report

Static analysis result for SHA-256 103e1363a21d6ca7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-18 18:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bef540eb115fc39f79e927cf8c7b1847 SHA-1: 270a2da7ae9f0c1a5c8ae9d7b09e2d0cab9b427c SHA-256: 103e1363a21d6ca7a9a94d722b2fd7ea18d15f1264c56cc8f116b15be78e81ea
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 https://laborke.ru/uplcv?utm_term=modded+dokkan+battle PDF link annotation
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zevubuzirovubiv.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/90445672341.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/somosuvo.pdfIn PDF document text
    • https://2winit.com/Files/files/67997845238.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376dd819797---kowijurukero.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/97997602420.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/60241468807.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/93955781022.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddca075da---nifixufakatelex.pdfIn PDF document text
    • http://shesob.com/file/files/26444506218.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fejineso.pdfIn PDF document text
    • http://sivam.pl/files/file/83012504346.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/24055279852.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xobazikedefoniginatato.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5c22f095525fd94496f91fe1cfe164a/vimufamageburab.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/lopisegotewax.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/16773580897.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/6641863378.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zegajudedaselatomododipu.pdfIn PDF document text
    • http://ellev.fr/upload/files/zafikewawotivunosu.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/9639537457.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/bimubotanoxadadozofuga.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/47651994824.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/bikisuvifexalo.pdfIn PDF document text
    • 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_off0000b0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E5 15008 bytes
SHA-256: f15e64322338d94fff7e6341f12fe62b28060bfdfc9fe6a779b3b6d34ec41fae
font_02_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 10108 bytes
SHA-256: f16a3680332e00162bee95277fa3016f4ad61dcada8b65efe81061391a28c518