Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d36603b659f4ca5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c30988dbf4d3d1ae3a5c96d39182a4ff SHA-1: fa549fc791fe2f74d2fa757e435886a4a0765bd7 SHA-256: 7d36603b659f4ca5f3b84cf002a98415896d3a4e0a61d800bceda16b8f6f5a75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/4dc36e00b5e889df88c467befc82fb6c/16506358117.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0294615b---kerobaka.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c6d24b911---kewibixegonuxus.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/zefesetozuwonunisa.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/dinigagolezejer.pdfIn PDF document text
    • http://mextro.de/upload/files/rirenedivepaguj.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4850741976.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e7657c041ae6d4f8e8182b90b9ce97f5/togoxif.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dofap.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609048986cdb5---84872050708.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/04b04d5d801c2eaa469a466a508502a7/malupegivixaka.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/rawalolo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ae8479ea---sejajasene.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/99621392737.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/suzufanoranuf.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210808_8567A6E91208DA2A.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2a4c3d1e---lijav.pdfIn PDF document text
    • https://megashina24.ru/files/files/fuviwifemutaziluteloduf.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/penizowitusudu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/toguri.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9d5e3c48554402b284c4c37c78f2e65b/pufojozo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d3d9ac9ad---65330928384.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021512155012138.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/49824050462.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853e513ce53---43302059651.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b611f562510---walevupagolalivep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=miami+dade+zip+code+map+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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 18160 bytes
SHA-256: e9422d859f497b7ab29c534d89d78f92bea1cd2cd58113fa258a8ae06904e92c
font_01_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 10316 bytes
SHA-256: 83657021af0210f79f530c623aa8040756adf7e1a03d4154d164819edecc1d88
font_02_sfnt_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1