Malicious PDF — malware analysis report

Static analysis result for SHA-256 9634e6f70a7074b3…

MALICIOUS

PDF

89.5 KB Created: 2021-07-25 09:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31436f47ec688c2ab3adf2837022f0fc SHA-1: c5b88828a2983fdaeee10cd2359479766b59500d SHA-256: 9634e6f70a7074b3acf7ab36e3467dcc4eff00804639750a878ef6d3e7cc8005
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. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of multiple external URIs and a link farm structure suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mnogonomerov.ru/uploads/file/48970184491.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb88dd7548---lamaxorunurajewo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc0241fd3---59914499451.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/90579043585.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/5201631015.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210609_6185FD0597999E52.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/64fa7673b5e68b267214537c789531c9/88271536780.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/97238446216.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ad94a2a35---69815033823.pdfIn PDF document text
    • http://merwepizza.com/upload/file/ketotederowipebatuzuso.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c8f693df---xobevarubonixejomobebud.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/34gisffts428uvbmq98ci87qmj/jifatupaxakedudesilam.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/32307762961.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/84756844094.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b6663ff18897c041be4a2a2aa2cfbf25/losegisojoziwat.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/latlkfsk44g06krb7bj7tdglk1/17087503783.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7309dd7e53---zagawubupimo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kutofelopivodopiv.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/10659720526.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/gewesujubafu.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/90913631113.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe0740f16---71441296711.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/zusowoxafasawopena.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbdc26940b---ludikirinowumifazatokux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=why+did+dan+leave+survivor+39PDF 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_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 10860 bytes
SHA-256: 8ca9f69dea26de26356fdf48fcc94a38c8a017c2bfc947cbc2b9b3e2078b082e
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 17800 bytes
SHA-256: 1742c7aa74e935d5983fa6c6402685f830c91d77a8a10748aef19f544e2d9492

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