Malicious PDF — malware analysis report

Static analysis result for SHA-256 5464533194d41f32…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 11:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22cac1d33f9147cddc6f45f6852d8882 SHA-1: ce555464918d41860361ce3cdff5f0354ae11dfe SHA-256: 5464533194d41f3211fd7d9587b5bbed098f90f4f4524baad656c9f93fa15a86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain executable content, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://langumeistras.lt/i/File/wofimojekurezom.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609434721e006---feziropavugetirit.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/87859874055.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/savimudokijojobep.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/memapinagidowegudefob.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dc93f8f8d7e6abae95caaef695a7e1cf/rozud.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/sepevipisewojasivefaniraj.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/16809280772.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365c700042---10061381025.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/h0ajail2nhvmhdtm32jihlavm5/87739591088.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/nakosufalukudixofo.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/5107592414572d226938d299106b3a48/rupefewutirufirozasito.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7536b1d0---85699441768.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/57866662492.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xuwomuwulilez.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f83690cb---lawinib.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/votonibebizaje.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2557_20210530091014.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/lewum.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bjvuhsvkf6038jf708smr17jg1/kusowifoxono.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/kazilezoligunatorefugagog.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/79515963553.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e006aa5ec---65498893823.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pefufijebomos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nptel+mechanical+engineering+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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 10756 bytes
SHA-256: 4bdf03b5633680e8f24d12384e8523e13bfd8ff3b13b4922b9148558991fb2b0
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 17632 bytes
SHA-256: 2ca3e02c3ec8900f2a8f0e2e24d53d0d8030bee9b25e237ab5adabfa58d96d0a
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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