Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea6ffb5ccc86937…

MALICIOUS

PDF

77.8 KB Created: 2021-07-07 19:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2070dd2d1615955d5b7aedf07e859c8b SHA-1: a656f43ce4f6725431138907eb6fa3dc5f6d5246 SHA-256: dea6ffb5ccc8693727f533f9d78084f29fb32d6852692d0a4842bcffb6945ade
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jp77i69ioa8gjae60nbm2bs5i3/58201215203.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/784b76594918121572afd5025187ae40/xujajaxidifobonaxulinu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f104db56155ab70803b6c385a335d550/38653064289.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/31587422344.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a07249d5---17782465331.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/janinik.pdfIn PDF document text
    • https://nevisnews.com/userfiles/maxelonu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c351022da0---58047897905.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/tepazez.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/nevimozidanejedazat.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xavujesenojasumuguxom.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/06ab8e063ef80851d28342ab00600c28/40293405810.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3e2041a2c---82594310595.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bb6d55e8af50cc587be14c6a71a1173b/40686311118.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/76085329947.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8b9bc0a6---32540655651.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ccaa31ba18f030304523e44d7d746861/zajisatoduxikofavefuwuxub.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/979u6tihfv5cspkr8medrllagd/tibuzefeb.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/71172102129.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/56b13ca308c996bc21f2ba2e531d3533/90250604823.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/fizamenurevavogakixe.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a341cd7f3c1---mumurasapafogevidivamesum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+quality+points+meanPDF 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 17264 bytes
SHA-256: c01bb3f925a07f4d1553b3257d7be19423ac347724ed83dc1da0a40d254b925a
font_02_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 10912 bytes
SHA-256: 29ee51437f48ea2c7f544b48e91912db7ddf7736df6c9005404f012eff01d8b8

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