Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3914174f72931bf…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 04:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ba8761304fdf42cabad370ea11fc40c SHA-1: aa0362f7d8b3ec46c1c507716bd952a03698325c SHA-256: b3914174f72931bfeff58eb0754db43ebff267acd5626a53cfd6fbbc96523a78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ot69litbbm3ht7b9s56hv5dth4/nenewepudupepanukopimaxer.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec87c6039---31623494259.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b83019b6947---63005912093.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe21e2295---bofeg.pdf
    • http://waypl.pl/upload/File/povifiponewu.pdf
    • http://gdwtechnology.com/fckeditor/file/lowav.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14qovl1cjnncjljar3k8gp3jed/jexidasetapavepujimo.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4950024e8d8f8a6c17ca8d0ff9598a6f/79809572263.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b2158d41---pititakumi.pdf
    • https://stillwaiting.org/userfiles/file/10686938462.pdf
    • http://bakoca.hu/files/file/79316037616.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090060f23662---nivivopujelu.pdf
    • http://polletnv.be/uploads/files/dipuxibepapotegozojudireg.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a3ae357b---79717478075.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ntfarfdbdd77j34mvl0p9eci3e/nagujonoxararefokuzedezon.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0f2a5e18bc8f8cfcdd117ee8c5f572ef/23851880924.pdf
    • http://maihome.hu/admin1/file/jususewavizumuvej.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/16dfbe700f6fdc9a238d52f8e3b3396a/47450089265.pdf
    • http://rialta.ie/userfiles/files/2461341751.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/623147fb19020458c43d38482e51c138/38842950409.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31994c1778---vaxubigorinenowazuj.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f7a6b96f---vapunesagowanada.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a387c0f01---teminigimujezakexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=furry+hentai+game+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3eb.bin
466bb2850e30048d6468cb673389db06991a02857fea7d959cf0ef47dab3780c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16484 bytes
font_01_sfnt_off00011ee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16792 bytes
font_02_sfnt_off000136f7.bin
c0aa40f59978c0de6bb3a783abf77cd5a6777bd048a3669c5d28d0d80273b778
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 10804 bytes