Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18fd19d568e3d20…

MALICIOUS

PDF

73.1 KB Created: 2021-05-20 09:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7988433c19662d7bc0d75e86dbbaadc2 SHA-1: d949c13cc777c19e62b73d0474c9b79fd70a8d76 SHA-256: b18fd19d568e3d201c3f9714e0a36ac3e6c324a66e6695fcf134734a9484f709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is detected as a phishing trojan by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the high detection scores indicate a malicious intent to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.myosiaffiliate.com/199trust/img/file/64972250548.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/a84uftpmvo7mhe3dmj1fee37u2/57789446849.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e254a8ae30e52aa0eaed8c7bb6c8221b/ruruwolukexorowe.pdf
    • http://antifftech.com/uploadfile/file/%5C/2021051612220518.pdf
    • https://karinbentum.nl/uploads/file/68460819406.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e624990d7d4779bbf23c38104c51b71/58555169064.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080a78c55434---rukipoza.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4b4kd07h8mb2g2s3e0sbon3hcp/27895820215.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab9d8b11f---zudarajufozekizute.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e6c7d22b1933465816b583692de1f33/87480700343.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/701c3523f597967651a3ec12f14f241b/40701639819.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9d366eea6a3597672722454d56a3725d/visej.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8692ab2bd2c772732d861d977a486af8/1365929351.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/35d22bb80741a3593314dc7497333cd3/7316390187.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccf2da6f4---fajiviriwafevidesujina.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d7187d80---jaxuwifi.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160700e2ac1cd9---4649512703.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/munm1dpa9m40eueq8c9id52075/79530994170.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pop+piano+accompaniment+patterns+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d433.bin
133de5537c4bfe66eb29c289856e3eb5e38f7d0c0079b3e644a32fdcbf750743
pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 5060 bytes
font_01_sfnt_off0000e539.bin
01e27187f1221bd9b2665d937d13169df7579feacd2234f2e984deae3164b4a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE539 10400 bytes
font_02_sfnt_off000108dd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 4324 bytes