Malicious PDF — malware analysis report

Static analysis result for SHA-256 971d5ae101e39c94…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 10:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16ecf1649d422cef63f3c59616193784 SHA-1: 114527a5506ea4ee7140614d22c6145ca9a00811 SHA-256: 971d5ae101e39c949760e628dabcefdde8e856d3bc2dea8854a027c3b35cf110
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=beauty+and+the+beast+piano+sheet+free+pdf PDF link annotation
    • http://wasserburg.pl/userfiles/file/97668871879.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0c5351dc---xibedogose.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607617eedd1f9---97847992306.pdfIn PDF document text
    • http://araonline.hu/uploads/file/84457228585.pdfIn PDF document text
    • http://kccmaul.com/files/files/nedokugupadivezumopuwow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b647ee5c3---favul.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/newalezikezuruw.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607faaa977719---nexosobom.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/vigerebimaruxonutokiza.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/falazojirerusazirij.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b545dc641534134286294725a32d8846/guziwoxusipizekilutodi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b1753879d---23392043756.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2ea6b6aa7a82a094df2018087195da8a/11381409947.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/84462281562.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61212035477.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/58ba9a67753a0e9671a5bdbe67656b33/28766242421.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/57284214269.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/21f472c1175b2e65c7c6511508f01c9b/fosalaxomuki.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1debecc870f1a47e0a7feb1f2099a3ba/sugutas.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/24805064946.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/tabanamogoli.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/81449517587.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d4d2651a---buruviwitex.pdfIn PDF document text
    • 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_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 18972 bytes
SHA-256: 4ddb3ab0fb8700ce5762739d1eda63f7db0c46993f961c60328563ef86c67692
font_01_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10956 bytes
SHA-256: ca8ac281e75d73cb08139e8dadf897890c6963d974f2b5608f4279e08d9cf013
font_02_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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