Malicious PDF — malware analysis report

Static analysis result for SHA-256 b451d8e7093966a7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 03:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d182d61da9ffa165f150860d2d814d2b SHA-1: 770317c1cb7c691ce4fbbd58a68cab1847d6d95c SHA-256: b451d8e7093966a759ae7d0757bc1609205a98baf163efe386d6555b7f67e3f5
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. These links are likely intended to redirect users to malicious content or facilitate SEO manipulation. The ML classifier strongly indicates maliciousness, and the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alexanderkanevskyartgallery.com/clientMedia/file/venugododo.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b79f1527---66006434663.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b0632144e---pasizudatozito.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32376e0b57---muveji.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/42625939842.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/70281432422.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/da7bad23228b109cf77d0bafd184221c/21016526667.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/foxivuzatesepeku.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/denaniwa.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/sajabojo.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/38860404268.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zuxasuvumerotanavomenaka.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105b8b37c34d---sanaliwixepefobuxisema.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9cmakd2m0mvroghlfdfsm24f4/72148186035.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4ba8c2dc7---17591298256.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09b52fc03---6380253592.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c223e6eb80766e2a26f17abec185b925/rifadofo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/614bdb9376e8e28585cd234f4c0769b2/boxiloxo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/dadiwilojaxaveredosiloni.pdfIn PDF document text
    • http://dakmet.pl/upload/zofisowu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/89876133596.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/99039906272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wudase+mariam+tigrigna+pdfPDF 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_off0000ba00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA00 16292 bytes
SHA-256: 5aa1a1223a01702358e1444adae0e9afb945f7a994dd9646258c847ae4b161a3
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 10768 bytes
SHA-256: 72bac8ad1a38e70607493de8b49182aa0094e9a434e60df836ea6c7339533c86
font_02_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1