Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e23d88d8b5541b…

MALICIOUS

PDF

88.1 KB Created: 2021-07-06 06:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c7decc194f15d807f5bfaf7a38475e5 SHA-1: 4aec313e0561236cd8450451bacfe61a5e2047d1 SHA-256: e6e23d88d8b5541bc8b8b07f0dd26e11ba65556870f636a1f738f75e8db32476
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sillajen.com/fckeditor/_upload/file/68535679478.pdf
    • http://wagnerpc.com/userfiles/files/zemukovinirawemiliras.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcad4ca4bf---33282915183.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e8c00b580554420b158c3380722c3b8c/fulikekulonijexodudo.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256549544a---jupoledarelugagenativejig.pdf
    • https://anthonygillant.com/userfiles/file/90038914915.pdf
    • http://akcjonariusz.com/UserFiles/file/9321316618.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbdc3dbdb---pufotatefuveverikusafojir.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4451fe80---volezubovujowuxuba.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c33b4e660dbd1e300e866e2b69c31c45/jiminitojaxexegofixabekoj.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/62973895364.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/96ca53817664cea357d284a84b94bc3b/betixeboveram.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4c738cedcf629a021888815ca24caaf6/vutapokopavavoj.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160df7c4235e17---dewelarozugatamar.pdf
    • http://nelly-design.ru/upload/files/14548980239.pdf
    • https://jetaime-shop.com/files/gotobij.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3lpo6l337kte2g598t0p4jek10/warat.pdf
    • http://asianmosaicnyc.com/userfiles/file/35363254894.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090c48406837---kakodixotibidinafi.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/uv8r6ln33bdqvkvrvf08gskelf/famebafemumojomufunusa.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/97132683222.pdf
    • http://gmicropilotes.com/uploads/files/93180759708.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ipgbbmh28o9babisqee9udsnla/gebelobolunanemobatuposo.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/ridusobulag.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff65836c5c---95743448491.pdf
    • http://ahcxdq.com/uploads/file/020713031330.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec86e50ac---firowu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0e787d596dd28523b3f8be7afc23c3f5/vukujo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=alan+turing+the+enigma+pdf+andrew+hodges
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 16792 bytes
font_01_sfnt_off00010d7f.bin
a8ce246efd91d3be1246198570a9899bca94de50b405c55f6cd618b311d1e173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16532 bytes
font_02_sfnt_off00013892.bin
9b6d660e9e81740b1829dadfc49804a8b8d508cd307152aaa8bb2b4cfe182fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13892 11112 bytes

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