Malicious PDF — malware analysis report

Static analysis result for SHA-256 d866f0dcdb3fd32f…

MALICIOUS

PDF

83.9 KB Created: 2021-08-27 21:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ba2f2665cb70f4406ec5d74f8083885b SHA-1: 10691b89d310e7e0f1c54835edb2322c8882fe8c SHA-256: d866f0dcdb3fd32f4378756a59f7b126ed04ce2f2c216e2db73b8d414bc48497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or link-farming campaign. The presence of embedded URLs and the nature of the heuristics indicate the document is intended to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=interview+questions+on+accounting+and+finance+with+answers PDF link annotation
    • http://graviroz.hu/ckfinder/userfiles/files/43696718319.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wijiralu.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/fupejiso.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/30ffbc9be3477229e91366d209f9151c/majopobotagakinalenevo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/52912737671.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab6867721---90613642309.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/pulegijuvobuxalosuwof.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ff26e5f032816453e2db4fd305acf0b/pesazetezamaresebi.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/jibebozogefaretuda.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100443ca57e9---42368535883.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nideroxunoj.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c896cecf66---fodidek.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/7728623843.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5282a99c229fdff4b1776752a4449bc3/tutigevalowuxarosunoz.pdfIn PDF document text
    • http://acril.ru/ufiles/files/konojokonanelori.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/nivojiwa.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/48092707909.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/93665934739.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/6294117824.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/38579411273.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fumagaxigoduwobupukaxuroz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/41i77s2o63kpbsfa8goqfbn3q3/kegulezuvedarozo.pdfIn PDF document text
    • http://farmina.ru/uploads/files/20960217412.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/18377071273.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/xerokovomesewejibaxok.pdfIn PDF document text
    • 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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 17456 bytes
SHA-256: 67f8ae93e19eee663623c99bf5cd8ad417dc692a49e2f03351ac7bf33a467ca7
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12852 11060 bytes
SHA-256: 5d7e9b9e04ea281a546ef6567f2cb1cc0c93193b8d4e4d2fd36cbd564cc584fc

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