Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a85d93f8dff39d…

MALICIOUS

PDF

117.8 KB Created: 2021-08-10 17:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74e00585605a9b4744b3d1baf8d8f7d9 SHA-1: 3b7d061ddb3946c8181af1fee3d39bc39331448a SHA-256: 92a85d93f8dff39d65b79d88434864c3a51e71cf6875f773352ab5d71044f95d
164 Risk Score

Malware Insights

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

The file is a PDF containing a link farm hosted on compromised websites, designed to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b8bac8bb357ee70d2206df3effcc300e/14313821734.pdf In PDF document text
    • https://travelone.ae/userfiles/files/voduwemorudufa.pdfIn PDF document text
    • http://alcantara.cz/data/file/wavokagudubisu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6dkhmn6rutjskss4j07bsm2qv7/94206472088.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/xipupunusazotivunelofod.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/1859550690.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tekebaxugonisilifebisip.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nawul.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608170a8e54ee---34646987254.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ea6adb8c0c6a50f0a6768cce04e54ef3/dagofojibisororobigomad.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pisusaf.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/feliva.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/metujuj.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5o1d952vff10mq38q28glk6jqh/subotewubakikubonelatuxax.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nekowosijuges.pdfIn PDF document text
    • https://medpressa.ru/files/file/xopemipujebevowixozuvada.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210730041006.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2093eaca---52874669249.pdfIn PDF document text
    • https://bloomeng.com/uploads/93127148468.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c8d21f04---getesikodev.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7ef1101b5---99099508145.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/tutebebuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=order+of+operations+leaf+worksheet+answers+colorPDF 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_off00016a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A71 17360 bytes
SHA-256: 38710d1e80211f7c03d05afb98dcd5da6d4c725336af7ff614613ffb7960ec21
font_01_sfnt_off000197b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B9 10920 bytes
SHA-256: 08fbd0f258f6e86587da1ab56113bd14ef8244cfe227438a911b0c4a7e236ef1
font_02_sfnt_off0001b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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