Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd45f7fa57d16a0…

MALICIOUS

PDF

74.9 KB Created: 2021-08-03 03:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86f52c1099c0ffe20b98b61494210c9f SHA-1: 8461d87855ffcd7f5d49597d9486cc9926a1d29b SHA-256: 2cd45f7fa57d16a0c4aea6533afeba55d1e61c37244980a713f520ff82543842
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 distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to leverage external links for SEO manipulation or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dienlanhhuubinh.com/upload/files/kivevojagavebesalo.pdf In PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/bejugasa.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/26436153070.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9735bbb9e85b8b8ea15c798c302c0bb0/dilifusezeta.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/81253916778.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1610469407c516---sowaputirudanitefogaxigan.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sis8ce3u35sf91tt5lf99kor74/86853529711.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rkfer1ua4ir88ltttibv8uj83v/fuxanitopi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ef2f1dc03---67511472279.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/0d06e8df432c51ef47312f892c250f9f/wunonimasigekas.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ketisinulojin.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd41b799634---47612394303.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/gesitojetowunipopup.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105af7db5a06---vanigegaxom.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/ruxupemunujel.pdfIn PDF document text
    • http://rts-3.ru/upload/files/gaxaxotejugajika.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160945ed2ece45---doxexozuzesujodorim.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/rakebugadej.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2ab7a3da---sutulevijivupejegi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb652d420---70098735707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=parabola+horizontal+con+vertice+fuera+del+origen+ejemplosPDF 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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 17328 bytes
SHA-256: 3518f5a9d9c80a2c17adad70d977235832664ab3dc29c514c55ab9407d51e9d2
font_01_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 11564 bytes
SHA-256: 4a0aa526db09d24f6dcfeb33e6f05e43286dcda280b8647fa91d0a86712684fe
font_02_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.