Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec5215154686bcf…

MALICIOUS

PDF

126.7 KB Created: 2021-07-03 22:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6960a3e5bd54c8ab284d14967dadbec9 SHA-1: e80380f56fbe71aaba8859975282cb0a0a9fd022 SHA-256: 5ec5215154686bcfcaf5087e13d88d49a8d135d8103601c07a74bd6e943f7f8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • 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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b291701290b---vaxirasigujafatepojinezi.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa8a285e4---wukusixetasovofinabos.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jfg1bsc08f1u6vnmmtf154dvr1/19591624213.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160709e13a6053---39854288617.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/79942574300.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/03ae6e1918919cbaf46b70e6fce4335e/50450943133.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607309580c6f8---zavufafupe.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/wefazidolob.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3c837f096a06b5e25e7071b28b8456e6/7956796950.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/vokugemudaf.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vinukogosiwawopibupef.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/84044618906.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/pazexutudatawibatof.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6ead2a4f4cbd8de7d8f9f34c104f6417/88320987531.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c2c211ada665828c5e8427ae18ace00f/2826024802.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719c1c37446---69059960608.pdfIn PDF document text
    • http://simpli.ie/survey/userfiles/files/keditenebotavuz.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/sawifekabekivaluxomuzu.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/xozibupowagidisa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbnteh7deo0se3p18ob19grfk8/rirunirujazo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a921834d2f8---99115691860.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/gimibo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f067436fd---86466351480.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/84096904917.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/15887541916.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f067b4e5d---nepiper.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/jafareveretanurudiwijup.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/lozaketapate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=class+2+gk+worksheetsPDF 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_off0001900f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1900F 10520 bytes
SHA-256: 5b3a2a8f08fc5f24a99b6b5f51537df8480824cac8ea9ff11d841afa613199b8
font_01_sfnt_off0001a85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A85D 16968 bytes
SHA-256: 18947484ed29e513cbdec3695866e0a18eed1beaddc278d26d0681d1d0ff4f83
font_02_sfnt_off0001d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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