Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1764d173dfa48b9…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 20:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 601402a69e24e2cbef3fc74ec3bdfa80 SHA-1: 39d0566c013127c8279eb08a6b2b627f6822b2c6 SHA-256: d1764d173dfa48b99cf59a5b8ea391e85d0ba20a2ab3041720c4f51284237c9a
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 multiple compromised WordPress upload directories, indicating a tactic to distribute or host malicious files. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dba3216e7---zipuxuzo.pdf In PDF document text
    • https://happycolaborativo.com/uploads/files/53725159000.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d8283ec9a---70888369836.pdfIn PDF document text
    • http://recrute.fr/files/files/xamutuzoxa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a197d85b6cd---47077480060.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0356dc954c---xejutuj.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/zozag.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e792ca0a---21034025643.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/44902155551.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4218e00d8a3c35e22d776827e4d34f95/82197654929.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160862b48e46be---53336804587.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160722ac53bca9---mujadumuzaduxa.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074569c988d2---31141992462.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/sikijimogokomemu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c74bd8d83---92804040683.pdfIn PDF document text
    • http://accronline.com/userfiles/file/jobas.pdfIn PDF document text
    • https://atl-50.com/files/file/moxamuwategoto.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55385095731.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/54478035373.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/tupufodenuwanun.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/14cccf7c27abc643a86c1fd491325d0a/19521198241.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711ff5a0407---38460624899.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/16815528217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+the+gradient+of+a+line+on+excelPDF 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_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 17540 bytes
SHA-256: 052d744a614cbecff7da2177692aa27925997d501e8f6bba87821b669cc174ec
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 10768 bytes
SHA-256: 4945c84725b723ee2d9b0382945b50cb32f6b734737cf1a58b7385bbdc751cce
font_02_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1