Malicious PDF — malware analysis report

Static analysis result for SHA-256 464b6cebd4759f64…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 23:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52a25eccbb78068b5ed2a7d0671b48a1 SHA-1: 3b6ef47e1729851da033ad78dd18da3833be0296 SHA-256: 464b6cebd4759f6451f5a8bdcc963e0a64ab614f5cec04a2dee9bdf00cb1a5c7
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://goldenbaycruisesagent.com/userfiles/file/wawinokezi.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/11976969737.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/piretefaxuvunidatalise.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/gezet.pdfIn PDF document text
    • https://panama4d.com/contents/files/dinegukosovol.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/36790698088.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/37818344717.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/xixamuvopefagadusol.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xobijomuwugixitilomisamuv.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c2a2bd5c7a58d8a3e447c66745f47594/jefelisunagezo.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///xuvebupo.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/mivoxosafita.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b843dcaab---zejazidov.pdfIn PDF document text
    • https://premiersuli.hu/files/files/fejobidarosukuxigu.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/paruzimu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/24829049718.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c87c9137---masimapesasemapetus.pdfIn PDF document text
    • https://12shio4.com/contents/files/luxogekotezogesakitemaz.pdfIn PDF document text
    • http://taociren.com/upload/file/210903120003650127j2g988o0i13v.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f7a9f78501c806a599e891288e0977cd/75398395939.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/49771878749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brawlhalla+apk+download+for+androidPDF 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_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 18028 bytes
SHA-256: 8cef7fcd0935cf323f010c45dfadda83763758aacd70d4921e07ca06a4ab7aa1
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 10428 bytes
SHA-256: be5218c7445c7730d558fe293deda0eefce10c3cf40a2b4b91ce61c2ea659857