Malicious PDF — malware analysis report

Static analysis result for SHA-256 e403560864ad5d67…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 14:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9ce1b2ee7dcdb013943f0450b9afb17 SHA-1: 61b6233a40cf3de5daa778dcb0dfc48027d524ab SHA-256: e403560864ad5d67191689f16f040e9280c984237c9bd107e1bf3bbb1b901bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous disposable hosting sites and compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://tasteofruraleurope.eu/upload/File/67350213061.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ffba863c5314e8087740c49dfa25d0f3/8730413398.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4648788301.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ada68ec70835965e0385af9699ee00a8/64679260773.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/62d5b58b973eefaa6b478b396adb6d02/37514865462.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b7776ca2---99550580865.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/gapq2vg48v4k03h3diq19d9d11/rubufoponosizidavoma.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/67312096652.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612175b25efd1---32569653118.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ac37ae2e8757acec1620ad84c9f979e2/90542915780.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/69822189985.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e38ac9a6aeb08ca0fe9e42dbb3857f90/xaravufeminuxujemu.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/budobapa.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/13096233740.pdfIn PDF document text
    • http://tai-group.com/upload/files/navixekotizopugazesiwizij.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e685dfbe9---98604647083.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa3370aa3b---sapilokupodugekuveboke.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/36066859245.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/39347332093.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/81984358040.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/39809716409.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/mumadirubewit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vision+ias+mains+test+series+2019+schedule+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 11416 bytes
SHA-256: 542eb7f5823b570f0e8faa40a9083172599944f5c35f0685ef86a1bfed38a391
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 19552 bytes
SHA-256: 16f5334be4cda51b2c10e059814dec258c973f0cfa4475f64001b399f3de93be
font_03_sfnt_off000148a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 16352 bytes
SHA-256: 8605df3499ba8718cf66c89c4660f8d33b70adf940130ae8682a15bd600229b4

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