Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bb5b4dc699f0b8…

MALICIOUS

PDF

101.2 KB Created: 2021-07-26 11:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6027c1f2af0c7764bf5af17892a2c286 SHA-1: 03bed5c3729b9f5fc505e5e26b407b56608ecb87 SHA-256: 16bb5b4dc699f0b85d35dd6ac44f56ea21fdfba69354c63462b24ed953d4bebe
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript indicates an active component designed to execute within the PDF viewer.

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 https://mytekas.com/UserFiles/file/zizewodazetojowasogenowaj.pdf In PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/siwotu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/e81542h335oo8gl4tvf786vnjo/63934024041.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706b28480fa---rixufi.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/rejenomigewinunowuv.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ac1559b66f0d9eb6c393cf222c0d75ce/bisuvidipiwu.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/rumipebelazelexo.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/df2d78aee035b6a2f4c7cd9f16d0ca2c/livedopevane.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/dipopazukirizaripemef.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/270a6fbc370f2caad2c1a7d631a76a45/rujepidalaselesi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2afac8ec3f2458293b4fcc971fc61749/laforejuxex.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8728384c304d4cf203e4dc5d2ec1556b/vebabusedujafore.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/no5i1ip0j4638nhi963h8estok/16551379240.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lagimanejefikebaziziwumam.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/jekimozuvaxa.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e579c79777---71244482766.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/42747393611.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/dfa55259437716e2fd74d864ec38b6df/18147917188.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/cff4aae2c1d367d399d824f108ab67a4/dubedopovarazum.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/249c332c86a146bec97057c7aff1fe7f/bipumed.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/037144415bc4cca81e0f1b6f52a98143/96139401922.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/kokiwizese.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/jopumipi.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanuneke.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/93553284523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=le+nouveau+taxi+2+methode+de+francais+pdf+downloadPDF 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_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 20376 bytes
SHA-256: e73cd80a585f61dde973334ad24c2dec5859c2c573e77acb65fe6ade44f699f6
font_01_sfnt_off00015302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B19 11316 bytes
SHA-256: 281bb55bfb20e55193bb11a27d443199fd1fa76a75deb07ef8340dea834699a4