Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafeb041b8a8df9a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 18:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc2ae8c407c0bc9357ccadf5f5dc5f87 SHA-1: b1e5d161bff7f6a987ab3f0da38d9c35f5a89235 SHA-256: cafeb041b8a8df9a168ef571730f3e9bdf5de9c3cc58f8a28cfd0a4fe790260b
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 hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://garglob.ru/uplcv?utm_term=auto+clicker+premium+apk PDF link annotation
    • http://krcatikyonetimi.com/userfiles/file/bitamapejek.pdfIn PDF document text
    • http://come2menorca.com/images/file/wezap.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15243784290.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zajiror.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/04ab07169176fc36736d88eec894c336/zubejozogutofadu.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/63906876493.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210905_34B53A427EEFCC68.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/tejavul.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a0a2bbc5c7c9fa55058c006d7278eebb/bojixalibovokame.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/25156776652.pdfIn PDF document text
    • http://thegioioto.store/upload/files/najir.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/vesebabenofenu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f741c0cdbeb09686df5e54a22e7e6740/80863764678.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/zobabejukonetifi.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/76095743929.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/95578314233.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/marina.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/73915203295.pdfIn PDF document text
    • http://didula.ru/img/file/55143380997.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/74935500401.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cdb990efddb80a4360dd2e8146d15f14/28256721947.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56ee8b78e---98695477151.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369643d4938---pevagev.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_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 17596 bytes
SHA-256: f1aeec3ef472a6053d5a9183438fa3810965c6c56bb37b136a6550638e154459
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10436 bytes
SHA-256: bef0bfc26150ba36cc3e1c7f74612fd6b70e46071d088eb32067e266669b1e1a
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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