Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce346e572b7798a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-19 20:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 515ccafb4ba97fbe21a508082ed6cd34 SHA-1: a6214c7f54b613d1e7607ca450b9d7e322f941ad SHA-256: 5ce346e572b7798a6013912c9194ef78f6ebd12708eaa515c28dde4ef1dacf51
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are flagged as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://anninhsieuthi.online/upload/files/dajimoniwez.pdf In PDF document text
    • http://enidental.com/userfiles/file/20210904123058.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/gubevaboke.pdfIn PDF document text
    • http://www.swiftsecurehosting.com/rsnpromotion/siteuploads/editorimg/file/mazitivagujur.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/rokipeg.pdfIn PDF document text
    • https://wrd13.com/force/file/73771866796.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86327876410.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/libobazuzofepojag.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wigivosinalunarezajid.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/butasibikoj.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/51754358091.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/puvus.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cafac6daae8b4f5e41ca15eadbe0e3d4/7821673596.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2cb33598c94120646f43bcc699a64108/tapapilorawogomuvoranez.pdfIn PDF document text
    • http://art4you.sk/editor_uploads/system/files/fijadozidigevitipezo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd3646017---70003952272.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/musigikinumedinokisuzexe.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/90933972131.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xuxigal.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/sagajakemutete.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/15001140406.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/disovobo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210905024957.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3gbbb421o79s6u2t429g4b9qo1/jamofedazebinam.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/5238603472.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/buzunumonuxoririzizubalu.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/78554598342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+janissary+tree+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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 19656 bytes
SHA-256: f3bc2e3ab118a6b7286f60f58a1135e54a2f5109c8354652d2fd604b117a7c27
font_01_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 10636 bytes
SHA-256: 495adfef6a904d3a0501aa15bfdfa4b24849e114cc7767e76f3afb70aa2ff11e