Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1ef341229f60cc…

MALICIOUS

PDF

95.1 KB Created: 2021-08-24 21:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 77f537299af8e9c87adc0365ed7a224e SHA-1: 78cb0c1b36a20268efd42af7bd3824b237e52c4c SHA-256: 4e1ef341229f60ccb28e4b7509882aa158345b8be70348bf91f7efda60d5c40c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kilazifabetobokuvefiri.pdf In PDF document text
    • http://citra.cl/userfiles/file/tifikobavogetera.pdfIn PDF document text
    • http://farmina.ru/uploads/files/21091855395.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8184db9a4---mesaseludumagekuwagi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae43c0b8---remabusejosevupi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/0tuhg14n8blbhdg71c2hjdv4a3/nagomome.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pvpr5dg3im1p6a55tkljqjvuv1/zulajitexoporisevaxixibe.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/turusogex.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e1967efb---51441481414.pdfIn PDF document text
    • http://thevale.us/userimages/43180350508.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bf2450f949948cba322d62efcdc5032e/xotisud.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/lebagowafeli.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/63157302040.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160775fc775057---naronu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j2lff64gflekb7qhhu9brkss06/punene.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/d1gfgpd9t63c8qkq7cl50cnml8/26275237803.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/238024264.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tidumalafomuve.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aff581721b31040b48e9d9a88bc01454/19134851921.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hoa67ikepq4512uo79qpiklom2/46781943640.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946cb1d5b08---ganitaxisazuz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8887e01d12---kotanijegunuvarunetuboku.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/janomibumipad.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ptng0ohh1pedoknubtmdlep70s/jajunibijir.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/febuv.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d403d9e8fc---padezukelotepudajukase.pdfIn PDF document text
    • https://people11people.gr/uploads/File/64279708511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=brock+biology+of+microorganisms+14th+edition+pdf+downloadPDF 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_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 18084 bytes
SHA-256: 4d03842ed3a9d78ba455726126c40ace258a29add4c0f12483bb6760e2200c4e
font_02_sfnt_off000150a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A3 11680 bytes
SHA-256: 22f214efe4af763d279afd50f97cd146eea14f5035c56fe9380b0b1e7d6cdff3