Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3aa72b73bdeeb71…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 18:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a55dcbb8c5e3ab80a1d8db2e86aaac3 SHA-1: 766c612a6a9f35e78962c87422ab845c422aa425 SHA-256: d3aa72b73bdeeb71b21fcfdfa68b70d72153f42a8f2e261decbd29b4d9e790ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe7397824---wumojesa.pdf In PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/78262467451.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/golenu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vumoj.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5399f1b2a---77985705877.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/vosuzimebawofuro.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/3921494444.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/6355841873.pdfIn PDF document text
    • https://ijpdua.com/contents//files/81777648155.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/k9l0q4ncseqilsmgkhu65ig51g/wividejakixenizotor.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/gojijuvepidadepurebez.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tagopo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ec53172e5a07f853ae52c3f37ef9ade5/10033029752.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/429dcd56b6e958b4916286ea540eef62/10886458773.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bubuwexujipe.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/fumizomoboriwijaputan.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/wesowafeliwebopigetaworoz.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/91066002777.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/pamizusuxikiruludupul.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce099884d3---kebonusupegi.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/58267699000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=development+of+african+historiography+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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 11248 bytes
SHA-256: 8d950d8da6db80d376872f0beacb7a0b66a2f5be74c6b90b9bb8e9d4d29cd44c
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 19204 bytes
SHA-256: 0ecdb285d636a290471838d03a1bf06591382f326d81597318a76917d3b877f3
font_02_sfnt_off000144f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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