Malicious PDF — malware analysis report

Static analysis result for SHA-256 227d05e003791e73…

MALICIOUS

PDF

138.0 KB Created: 2021-07-07 09:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9471f2ccc49750393385328d1163486 SHA-1: f6dd375ba6fd9da09df341e4a35ec94ec3853707 SHA-256: 227d05e003791e73a878ab5cc7436cd41dd2d6c257ca9400048436ff64f5efa5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The primary attack pattern involves leveraging a link farm to host and distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889b4f28e5c---xaxolifaluperofu.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/99df6b2ee16303508231a3ff9c72afe7/dadabug.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7119178b3bfc00d318354d8530b0c92c/72448012427.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160861f1c438db---17136442280.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/955da880bcd2d8bdd07b645dde58b99f/burew.pdf
    • http://agiusfuneraldirectors.com/files/file/17390232273.pdf
    • https://abugfreemind.com/userfiles/file/74412351709.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/romidogekezifobavaxa.pdf
    • http://portalcom-b2b.es/img/user///file/_0684424001619913104.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a0a950e3d63ed8a7faea190f1c9acbf/53950993719.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090599e181c6---zusufedix.pdf
    • http://apricomm.com/userData/board/file/71420492545.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1cf4dffeb79b036e0a62f649d554296b/98627069311.pdf
    • http://93564497.com/userfiles/22035461605.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/90558950599.pdf
    • https://betenrealestate.com/sites/default/files/file/murogewerigapopogo.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a54ed1a52c5---82547573114.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609843cb7fa91---19506686599.pdf
    • http://eotp.info/sites/default/files/fck/file/5400889349.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/c78k4ejejlaq5k8oq32lervnik/kosiximexunuwivuxova.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdacadef9---didikokusuzabavav.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fb4329f182---64081773925.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/382922c7dc7e66a325fd6bfce2a7c56c/masopatomewoguwijukowude.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f205b2ef---zupekufugoluzepewij.pdf
    • http://traiteur-ribot.fr/userfiles/file/98931762439.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/df38a75af628677e7f0637860292145f/konewokedidepug.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160765ad95eddd---wumikajosunifiliwaxe.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5f96431a04546da553ea13cc8bf60759/maxagenuna.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+human+computer+interaction
    • 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_off0001bbd0.bin
08cb659b6af416c2e73c27d703977aefde798a63f2918673f16bcaa4bfffc8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBD0 18376 bytes
font_01_sfnt_off0001ea56.bin
6c9d4fec3b13d7c7805d0bba2c1d524cd58cabf8862ad26ebc8740abf1de063e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA56 10516 bytes
font_02_sfnt_off00020220.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20220 16792 bytes

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