Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55a5c999a677b69…

MALICIOUS

PDF

94.0 KB Created: 2021-06-22 11:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a9afd6f51881fe28488ac25cb42a294d SHA-1: f7a03d1af1bd660f71ad43ea0dfaf881166465a5 SHA-256: c55a5c999a677b69b16db36347bda911296d190804760163b0de617e5df31358
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body, though obfuscated, indicates a lure related to 'social network analysis john scott pdf', likely to entice users to click the embedded links.

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 http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a089c4a7db2---tegog.pdf In PDF document text
    • http://tochalco.com/uploads/files/nukilutinopufopodetul.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/jukug.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/23233767980.pdfIn PDF document text
    • http://congtyvima.com/images/Download/nuzulalasomugimup.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ca79345f---setilujafagunitafawizare.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77d24ea2c---63075611722.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/22280194240.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/74692679039.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dipojutedowedomejabilax.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ee21f05a---89413577930.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file/%5C/2021050623571330.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/96660252851.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5908f16ffa---3285736920.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5p9rbtpf4e96cmpn8d063au09t/98587333556.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/malez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=social+network+analysis+john+scott+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 5680 bytes
SHA-256: c7a38916c2ea61f734892a6e7f8ea588a4bd07cf511f39de5440514fbbba4265
font_01_sfnt_off000143e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E4 12160 bytes
SHA-256: 4f4ad3c16d6fdbec8a16c951d5bbc36bfdcb4fd01432d41ab5c7ad83583e3989

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