Malicious PDF — malware analysis report

Static analysis result for SHA-256 24773bb82b70d9ee…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 15:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fabba18e4a8844859940bb418f7d70a0 SHA-1: 812c0413e9e70b92eda1ea8cb70af2572c39e6cc SHA-256: 24773bb82b70d9eec79dc00c36cc7f7637715b8c34feb7babd502f4aaaa0ce6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=monster+legends+mod+apk+unlimited+food PDF link annotation
    • http://yey.uw52.com/upload/files/siwul.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jafomufuni.pdfIn PDF document text
    • http://www.heksan.com.pl/file/sisumuw.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/bulad.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/provkspnprdcohe1n3ackn8mq1/loraz.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/jifipapikisosebe.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/safejukabufiripiguw.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kelat.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdf9141fb---12947397718.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lebanikam.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/ronesomigexupezukitidex.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rutot.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/1862700948.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/taxagusipa.pdfIn PDF document text
    • http://handgun.ee/media/file/rered.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7427080b8---45708129847.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/97854296586.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/rewomabovaxaxid.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/27541568919.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/67205290238.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/74037946475.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/zipobur.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/tibogani.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210908110159.pdfIn PDF document text
    • 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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 11024 bytes
SHA-256: b87e8c2ec4c8beaeffe0c0908a170d86468f9ffa41159e643d6d26b623d15fd3
font_02_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 14364 bytes
SHA-256: 281d17316a244564ac2fe61d376ec60ce1bcca6ce49c3f4eaf860742d36bddb7

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