Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cdfe92652704c1…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 12:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2d263b912c7f40abbbe3831b6e49f64 SHA-1: 6e5622574cc0541cf51bc18556ed8147fd77690f SHA-256: d4cdfe92652704c152b3dca21bc6e3405825cf7b6818a55045a03052243cd5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm and a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://robindayne.com/ckfinder/userfiles/files/mipeboxuto.pdf In PDF document text
    • https://maviet.vn/upload/files/48546882344.pdfIn PDF document text
    • http://wdnederland.nl/file/72167842152.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/30074759313.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3abc820abed9e132817c50ed57f5628f/gofimogixipolumabuwokisur.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc279f68---95057359900.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wibigife.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/28323028997.pdfIn PDF document text
    • http://progetec.org/userfiles/files/maxafodedozuxowifo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fobixa.pdfIn PDF document text
    • http://evola.it/userfiles/files/9643789021.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421b009bb1b---89233340557.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/zikegaretepow.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/dumupedakezofuvafigevira.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/tenijaderaj.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132140e5cd45---bovofogomenewa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161361cc457342---minowefikukowewidovise.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5b4bf1ab56c773ac5fb107b8f83900f0/kagixexaxonunesomimip.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/94432993438.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914142237.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f861693f3---xivum.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/86762800853.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/35003814879.pdfIn PDF document text
    • https://computerzone.pk/file/xewotafelesizesasewen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bhagwat+geeta+pdf+in+bengaliPDF 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_off0000c380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC380 10668 bytes
SHA-256: 982d9cafaf7fce2e09f830a84b4bab354e5908da2300d3e16a849bbf0505a485
font_01_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 17720 bytes
SHA-256: 5a8b961177e273076cefa7d374871f192b56e35061674d3cb4a05311b2809c6d
font_02_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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