Malicious PDF — malware analysis report

Static analysis result for SHA-256 caac04437627ee32…

MALICIOUS

PDF

79.4 KB Created: 2021-06-29 20:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c17a4570a3c8559838a12ac6b3d3defa SHA-1: 1f1328e260de5bfcb6a7776a7345a429b149ed44 SHA-256: caac04437627ee3276e761eb6a93fdd167247483cda949a2ee8650480d84ee38
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and link farms indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/v6vv1iloqkdnf8s1t72qbd7cva/74809697950.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/bakijerikuzamin.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/tovoduvilonopukuk.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/57636461719.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160738abff364f---toxigogox.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fe3812df---62437397516.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c0e03ec894d8db6862020f7e2d7310cf/xigibowiretu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608478cf0a55a---91283095530.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/68150488474.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/wegifoxa.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/09adfdea7ae16efaf9fccca59c43e876/4487302765.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e883c32a81---roxaju.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1944a6dae31168bbf2f8c9b651291cb8/busikedazibuwalakixi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c5a422b13f2b2e81ec49104356588ec5/nenoxeka.pdfIn PDF document text
    • https://mfdesign.hu/files/file/39376657576.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b2f38d9ed9ed7a592fc9dc3eea3d3a5c/sekonejoxafokelev.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/dapenozavefakopawajajetar.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/90180245295.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/80ab26536ac7433f7d694ed3f57b3657/15210735056.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ec699851---rusomisewage.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26295215348.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lavewifugi.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/60093766185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=30+mhz+to+khzPDF 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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 9920 bytes
SHA-256: 06ff926f2cc243ca3deefb421fae52294f2a9ee1649941439e01d19b9892cf07
font_01_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 17436 bytes
SHA-256: 0e4303095c21ce4986fca6a6c4e169d4f980f2070dd227bb08775ebf7094fa05
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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