Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea7b37b8b055417…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 01:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 929259e958e70a525997a377429b1f1a SHA-1: 957fdcd2484cdb7b32d3e258cedad3220c763acd SHA-256: bea7b37b8b055417e552136e7f2e50f15c605df8908bd8628ea81fb3b3b75b89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These findings, combined with the ML classifier and ClamAV detection, strongly suggest the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vietnamairlinescorp.org/js/ckfinder/userfiles/files/sowubirusexobigi.pdf In PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/mapedulimazofet.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/ropawizasoposokoz.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610b15a7a2---84845979619.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ec622a6dc5870eb3da9dee7b5a13d127/21937954869.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/dowazovisinemuz.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd5e26dc8---nerepuwijezodetimuxalekel.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pogoluroj.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/levozilokubewetaxitu.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020202433126.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436f8175dda---ripewobipugupofagoxosunun.pdfIn PDF document text
    • http://geoman.cz/data/file/lasegivetodid.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210918195331867214hcdy7g.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/vozudebamigowog.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/35323009268.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/vadakojanixurosanaguw.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/verasasifawoxirevevekefe.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c9dd3ec23d4035cd826635971ff86ea4/petelak.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/misekar.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/dinatekib.pdfIn PDF document text
    • https://projetovm.com/uploads/files/lafemumotusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+survival+handbook+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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 11108 bytes
SHA-256: 397fcb900f56f98c234a94bd6251e096fafdeb2c53d9fac52fb9fc92a8c368c8
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 18352 bytes
SHA-256: cc55804c2fba941b11794fa5aeab4f9420dfa96660c5cc3d71c1c50e94a502a7

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