Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8e90aec006cd01…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05f83654ad2d6e4afae3930359475a04 SHA-1: f078bc803ea01102b363fa3a022adef8202889c9 SHA-256: 6c8e90aec006cd01ee9d1ace9919173dd801e7142b2dda6f2d2dd2102676c5e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The presence of multiple external URIs, including those hosted on compromised WordPress sites and disposable domains, strongly suggests a link farm or phishing campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=gta+san+andreas+mod+apk+pc+download PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lbtvd5kpo5cl61co84lm927l20/89595129157.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614186aec917d---zakerafu.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210915_162630.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/48qf3c5hcq43i7d5gqshooaapg/75308809072.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/vokepexop.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/duzugapi.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/75324662689.pdfIn PDF document text
    • http://grafitym.kz/files/file/36549312179.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/9678268407.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/93759253504.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/fuvevamesenokesawonevub.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7a9akebb754k809lg829nlote5/labanovowegusuvogomagu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa67441e9---76207598729.pdfIn PDF document text
    • http://secoinblock.com/upload/files/ruxuxokowonubexanisozix.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/fofobivij.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/jepijimezupuxug.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/sujefevamemokanazusub.pdfIn PDF document text
    • http://budka39.ru/files/54016711741.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/87154380858.pdfIn PDF document text
    • https://masihpt1.com/contents/files/16787657250.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/92129638919.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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 10800 bytes
SHA-256: f465c1b1c7890d13975d477625c71129e9aed35db37ebb8942b0aaf7b3b295e9
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 18796 bytes
SHA-256: 033129d864cfa81fa0d10cd673a5e61e07b6120af2c5e50b9c811ec0e149c00d
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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