Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f072ec2c30437c…

MALICIOUS

PDF

106.0 KB Created: 2021-07-07 00:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 906f3d8a37d1cd55ad70bb1ac77da727 SHA-1: 5373c384961f43c134df6ab1ce3054d9d919a63e SHA-256: 57f072ec2c30437c6a18f1e47ef2d50a181b246100183c558b052c88576ca201
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://skolicka.eu/foto/images/file/64660493142.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/adc8683a59889898cae40ccd34039b75/92459636574.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/da9f61ae4482715d65a6938f3c5fed6d/talabu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c1d872e10e75e70871985a0cd6f7a877/libegiboxad.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4teu41bt93ev8o8i7bh6mvh11c/liliwawozosisudufagas.pdfIn PDF document text
    • http://nktrading.qa/file/files/nuburasidugobika.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bb9e7967---jibebajonewuwati.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/42355fa46486bff64eaa44c6140a2171/58903355801.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815dfad81e1---80913676746.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/8e35e12d1454217f1d7f7b0b72df3142/zaxeferasuvovusexebedivos.pdfIn PDF document text
    • https://digireg.ru/upload/medok.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/sejokewoj.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/woboxukokiwozifag.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/32958337925.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b245d0d09---65858473936.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d966f0612ae---masewirexosidubuveri.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608803679f755---lubatev.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/029944366e54d97ebb5b0c50ea082bb1/kidugutumerenodim.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/1600092263.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0bb4c545664f44bb98dc1a8a2c482e8b/xorenuwixolebaduxevufole.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/30160864244.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/78211762476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=constitution+day+preamblePDF 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_off00013f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15781 10940 bytes
SHA-256: 22e418c227386861e6c4e18ae31fd762382baf35c4d296ce3f113a0bfff3300a
font_02_sfnt_off000170ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AB 16304 bytes
SHA-256: f8601b6cecbceca4d0f0401609cfe38cea9acb67eee69a873901303ed0d0e0c4

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