Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a560e4b1b478fa…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 10:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d17f6661b3d2eca1f326e289a818843 SHA-1: 001e1a4d3dc02294625cc23c07a23f1b2f8dacab SHA-256: 58a560e4b1b478faa47b1e28573a447b0c9abb5f9ffe9e6976c98eca2af1c172
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6e606dc2028657253f6a58a1f822db9f/jenurelebag.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/58068876480.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///97693491437.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fff08fa11---73206691876.pdfIn PDF document text
    • http://seamacros.com/upload/file/52382787572.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/7rf0l6agjkot6uu83pm04im1no/nuvopolipox.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/banofog.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tebavejunazuvojovibirape.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/xexufomizog.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/cf154e470b63d461ba55539e51e6d248/35919922253.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/df54fd2c2b93b4f279b2f1844babe1a1/xijebin.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/51313520797.pdfIn PDF document text
    • http://debden.org/userfiles/file/46103239203.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/14390360613.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b9gl3uk0mvf9sn4qoodugjpii0/37586860818.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/eeacc8ed68542118438dc18f0d96f7ce/12897859945.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/dikobebafurajox.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7a94eb42f---11705335890.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/58479091015.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5c2c0ceacb8d321e0c30a9b566e62049/26494621639.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5i4gkfguota9amf32rgfficcv5/lidopato.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/65432643063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=perseverance+easy+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000102e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x102E1 18124 bytes
SHA-256: efc30e03d85c6db2d3aabf1bf5eba402d98b79174336c3bce8d8fb2cd5fb9421
font_00_sfnt_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 17876 bytes
SHA-256: bc343edca680f515d12b775797f6a51b81755c859b0f0bcb8e3932c1ba1d085d
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 10604 bytes
SHA-256: d240ab5a30b14f694b3f0946e22808fda4a06707258cc26ebe5da36845bff184
font_03_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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