Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a634efeba9ad66c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 04:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34b7fadbf2e7b32b2d9fe360a8035a5c SHA-1: d623c472d9ac08684e866bb971b9ef0b36aa4568 SHA-256: 5a634efeba9ad66c6c097c14f62673708880577fb512bd926f52da7e5ff642d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites, likely to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137df4073935---49001810884.pdf
    • http://zatexpress.com/upload/userfiles/files/zobina.pdf
    • http://steelfurniturecn.com/d/files/46591625547.pdf
    • http://ricarda-allegra.de/userfiles/file/wosonikesezuz.pdf
    • https://songod.vn/uploads/image/files/70604682476.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/16635793848.pdf
    • http://xyr59.com/filespath/files/20210912110658.pdf
    • https://thokhoavietnam.com/upload/files/ladoturupopiseles.pdf
    • http://habitat3.eu/userfiles/files/fajuxopolugupe.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/68321638688.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/boresosepukukesum.pdf
    • https://globalathena.com/ckfinder/userfiles/files/6980209586.pdf
    • http://letdentalab.com/img/files/xofovipe.pdf
    • https://komunalno-vrgorac.hr/files/kixitaru.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb42a8a13---pafivevinakijomabupewe.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/sipomogibatolegevevuvelav.pdf
    • https://adian.eus/files/galeria/files/jasofukirukabogefetubi.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ac2564bc2f4f2c50017d239d86efb83f/wulowetekedepodu.pdf
    • https://vleek.com/uploads/files/ponumaxolawedewatez.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/grd69hjlgrnpu3r0o3kvsr01k6/gewepeguzonazugolatozol.pdf
    • http://dakdekkersindex.nl/images/uploads/89296468187.pdf
    • http://jtg-antracyt.pl/files/file/sonibudiwaziretofod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pride+and+prejudice+and+zombies+book+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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38e.bin
f04dae4953bf482c6cf5e06d3d552906c712d913a4d1a0254d15ac9b2353ec6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 18704 bytes
font_01_sfnt_off00011399.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
font_02_sfnt_off00012bb0.bin
2cdbc3a0ff63a8954fb378b63565540c37607158044447a74dbb8a9f569e9cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 11160 bytes