Malicious PDF — malware analysis report

Static analysis result for SHA-256 29edb42504eae44d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-14 06:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c949a8987e25a68347fc4af47dd522b1 SHA-1: f297a9b1d50f9170dfbe4b71da089a3a5b48deee SHA-256: 29edb42504eae44de217c39850d211e79bdf50314f0e0f6bf5ece8708a9bd5ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, coupled with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the heuristic firings and URL analysis are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://gandolfiarchitetti.com/userfiles/files/740483769.pdf In PDF document text
    • https://yellowstonewildlife.com/vemitav.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/83693322774.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210914105522.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/21287482725.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/64363606013.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41374033560.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/1525973274.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3df365c14d28fcbae7024809e3b5412a/zuxoxomepilokifidolazer.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69721243329.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/ponuzetibirepuralokokas.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdfIn PDF document text
    • http://konberdbio.com/upload/files/kanis.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/tegawoja.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wiroforox.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/dofotelazupasofisujula.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/tamerolob.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a33038409---wuwofitakabadobubipo.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/49005048288.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/15729247935.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/dc38c0b42b546ffb25c52cf59a5ce39f/60214815053.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b4e6ca3f---saximoxogijifisi.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/81499646246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=things+with+letter+wPDF 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_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 15748 bytes
SHA-256: 578644d984dbd3673bfba2d3792ac197ce3e2c9c86399e87dfcb6b1f7ea5f1ce
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10152 bytes
SHA-256: a783c8d93898dbc98584ad0b4c15dcb9a569a6d9a663da094fed1e9f9ece76e6

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