Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe4b1305e279976…

MALICIOUS

PDF

79.6 KB Created: 2021-08-28 19:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf087d50e82ff6ae4474d0a18b793787 SHA-1: cb5fcffd1100ad9e46dd5301c7674671b04e5660 SHA-256: bbe4b1305e2799764f81fe9168efad66a3791d00e1855d2392108290a658f19d
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be redirecting users to potentially harmful content or phishing pages through these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://cezartravel.hu/userfiles/file/jigajodesasinoripew.pdf In PDF document text
    • https://shop-ecobati.com/medias/upload/files/mixasugujuwufe.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0622f3563284736cbe91ab1fabb5708c/vumudi.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27348315366.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/26573217971.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16086eeb6a0c79---19836871044.pdfIn PDF document text
    • http://c-six.it/userfiles/files/51476982440.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/lurowaxowiwoziso.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xelinojofuvugowefurujul.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/20759660659.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16118a2851e757---63329687625.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/88521213578.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6941322120---bizivalufunut.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/13522229919.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/o81pgrut4a8uaevrv4b2vht5gj/57540015377.pdfIn PDF document text
    • http://baoveantam.info/upload/files/xubivapijazapoxar.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fd0ec6cfd16cca5dd89cad4877f4fb77/xuxetaligerutude.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/74bca47c39a3672d92443cff73379aa5/52423110939.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/jpcjiq0nf9dm0lehr5nfjg0t7c/nexuxakisowimarevatu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/16314053852.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/batefapatitumoji.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/98751723095.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/bamosavamasutixive.pdfIn PDF document text
    • http://signauction.net/userfiles/file/fosigorirafufexovor.pdfIn PDF document text
    • https://phuquiland.com/upload/files/gapoja.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/777268bea6ef5aca3bf2b0961e85a10f/71124370005.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/aaesv45hnlimmddkaqqus7s37t/zesojom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=murder+mystery+two+codesPDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 17636 bytes
SHA-256: dff9878745152814352bbbc4290c17b9eac0e27a5055ae954d9d0b3194f9da25
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 10420 bytes
SHA-256: 800da478e2e2bffb7887fccdc434c18cd5006f4efef0e7df3d03ad60644c8117