Malicious PDF — malware analysis report

Static analysis result for SHA-256 60335ef5b748e273…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 05:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73b5b345c89a1ec2f0a8662d32429440 SHA-1: 8b28406aee1d89135c3c54dcf59dabcb0dfaa729 SHA-256: 60335ef5b748e273a9f269743358147b019723c0828094c100f350f68ce3b4c3
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or redirection attempt. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links points to a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/7f87bafbacd7010037c904ad4bb21aa6/48721054639.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/218d45dc4069f7f32782e365c3754003/6871658313.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbb83e5ba2---niriwejamezi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/sewawajomise.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3aed3c5f5d05c9e52a68168b59077669/minorodok.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609656987363b---48201059184.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3471bcef---86475391664.pdfIn PDF document text
    • https://linker.tw/files/28958164167.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0e82a33e043878813d99b1f1df564958/pewowagenanofipogetudovix.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadecd6157---12158202701.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/tavivet.pdfIn PDF document text
    • https://servicepapik.ro/files/zakojiguvadudipuperaba.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/772ee21481f82b962c791c87728b8e19/lusidukijagisodavejusaje.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/824d7a3d316a831b957ca64d4a2679a1/bigefuxupoxam.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b65ac2d8---82488481012.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/34271728423.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/73176623712.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ede927a3251d2a300ac48293e9744afa/57415077244.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cc142c60---24005856151.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e7f8443e5bd875308a558aad61c9350a/98095315200.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/38804770621.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/36477773064.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4534c853d---lukarubejax.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64344157275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+global+casino+6th+editionPDF 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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 10820 bytes
SHA-256: c46b47c41ddf3ed6a0302b9cc778f53aa00a06d39f24d483b8c299f1b3c02b82
font_01_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16696 bytes
SHA-256: d567466d7e11eff1bec63fec4e7477e361555d3e7ed6a3dd419d03e0a0d73b77