Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4168900a151e7cb…

MALICIOUS

PDF

85.4 KB Created: 2021-08-25 19:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50afb6e37718a897b2be9d277e92cd9d SHA-1: b83d552587755ff3c596614ca1a80722ffc0de18 SHA-256: e4168900a151e7cb90a5a8e1399e52b63cbdb472a1278b177afa7a7951aae797
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL patterns are sufficient to infer a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cdlp5e6mmh7pvigr5ttiptrvdt/buzukokakameguzulene.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/pqpa9qhfm3i7c758f2su4n93d9/venolamamud.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/xavoxuf.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/17035029419.pdfIn PDF document text
    • https://pecsikult.hu/files/file/95922062942.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/99776585347.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce721fd90---buxalosa.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074bbbeec349---lunoboxa.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/94914440839.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/69791705288.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7695d90f---11344207484.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/21022dc2814eede8d9c73305bf28c7a4/nunenomedibegalisadig.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/pufogube.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/73500583033.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ri6pvi7f775fsbufnfumabsrf6/54474443462.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/53148759494.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/kepurikiduselujebol.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/49741687552.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0c242fae---munisufidevuzasarugi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926d4ac83c2---vexirijefipadokod.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/10563037416.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f3c7be023411994a007fc021e5f67416/feguvujamebajad.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/95208727015.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/bazelakesavarexeko.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ede1a47d4fc---68885551708.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/km7a3f0lgns5e3i12orp2iuu62/40213070533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=reaching+the+age+of+adolescence+class+8+solutionsPDF 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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 16548 bytes
SHA-256: 793ddd62101db02026a96cb5555ea5e959026f49ac691674dee6069782101f6e
font_01_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 11008 bytes
SHA-256: d76f5b1194527fbf6805c49c99ade30f1d6aa102165318438079d2a0b0e25841