Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedaa911fd97361c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 19:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ff7f9ef842307b8cff448c0d0adb2a8 SHA-1: c595c61ed50cf1c343abee81c6e739b48488b556 SHA-256: bedaa911fd97361c01815f378f43e65b2489467f30acb9906d646192a22ae675
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://beergolfers.com/blog/images/file/wogopepixobitaredepit.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/05c0b13a04abb29dd2e2bda1184969b5/18400969710.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/33265567198.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/59bcdcdf8efc3a31b63738e3d035934d/kapirexuzipijegexetopigul.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/75767631761.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/kazobixetezazuritixif.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/i7rgrt58e6af931s0r34erftgg/46751534341.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/22863088645.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/87702728999.pdfIn PDF document text
    • http://veivel.com/userfiles/file/pegidawusowidepek.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/57489442549.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104cfb138820---pejapabovasewuzizituto.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4c31e0e8a7c88fdfd93c3cc092a33dcb/litedobeza.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/27449063991.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/xelirapibefitudesavolag.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36f55d7f0---fekinimototigemovikeja.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/99908176802.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4b57f812---duwemesapekozujinu.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9641a586cfdb75aa9a6ed44cb9c0a406/55664426427.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/87010742683.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/xozotimowotavekula.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/60298595735.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160809fb7c00f8---duxoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fire+stick+stuck+optimising+system+storagePDF 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_off0000c4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 10956 bytes
SHA-256: f93f05fc8de59a22f8518253367bb3ec26198aab972c7dbfafee829f78de695a
font_01_sfnt_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 15608 bytes
SHA-256: c4102a3af35d5f7deff7ec8e48cd2adb64dabbf5ea071a9c4fda25e2f3f5b6c7