Malicious PDF — malware analysis report

Static analysis result for SHA-256 484d347e8ecf5c98…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 21:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32b87b5dc46ffe89a567b50839f09892 SHA-1: 9317264ecc4aa1b2865e51bcb55309ea26e0e979 SHA-256: 484d347e8ecf5c98492be77cd5d480e858793293d382eeae1577e1387cfdf95c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs found within the document, many of which point to compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tksq1s9ql0kcko1oqu1121j7p4/datukikotetexejuvetaxa.pdf In PDF document text
    • http://tourister.kr/userfiles/file/23913365493.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/wejabazogadefirawiku.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/mutiruxunipokob.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/75e492c868adc671ebd66ed7f069a8d4/nurosimijabirotoxip.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e06dd4968f---wugar.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5b1d6f7d---felufavuwomivutinixis.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c7d25c35---zifetebawutekujeseroniz.pdfIn PDF document text
    • https://cubic.is/userfiles/file/nuzujatidame.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/xawakud.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fa245797c02f663b6f9574dc7d411927/32174566850.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/tejunifebage.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8e4d732f---2047939619.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/vejadegoposugitumupa.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/63013659792.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/simawupilatebajukigapoti.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/57302140401.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/30189761138.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/75736670476.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/sudakadedobokim.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702140b07a---nirafovuvunezexin.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e6182348---luzisovokodak.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210620164254.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/d4pcasfvikvi1pt55dpjbsdnai/96894995336.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/makatik.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4402b7bc8311d0b8db70d586e149f905/gowavamison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stihl+ms170+parts+pdfPDF 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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10704 bytes
SHA-256: cbf4510b0c936469de33a88d60199760142830a472616d2a043f64e6943c58c6
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 18304 bytes
SHA-256: 91e4a71ba46c7acb12b20ad2ca8edc7f2ab7b6389adc936a1d013dd244c70132

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