Malicious PDF — malware analysis report

Static analysis result for SHA-256 f587c50a167fb769…

MALICIOUS

PDF

91.0 KB Created: 2021-09-12 13:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df1db76de2b86ccac02e8305fc637cc1 SHA-1: 28b09415996084b58d748d5298d5e5da604fbda6 SHA-256: f587c50a167fb769ceb5101aa0d47d62a87293e7bf97c9ddc0374c4be5a8c3ee
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a social-engineering lure to install a browser extension or update. Embedded JavaScript and numerous external URIs suggest an attempt to download and execute further malicious content or redirect the user to a phishing site. The presence of PDF_JS and PDF_URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=how+to+make+chrome+full+screen+on+android PDF link annotation
    • https://cdmsig1.com/ckfinder/userfiles/files/wuzivemoridut.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/pirajefoxasugejexuz.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/xokepigizoxeralulurinapuf.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///sonulepelaruguzatokeriki.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dasojineru.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/66919584602.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/kutujizidivuluzalirope.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/27533830352.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/1438462047.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9f49b81b1---xegudasiravuzemalilupuwe.pdfIn PDF document text
    • http://newshop.jp/archive/file/2233610820.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/6187553418.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/95561866408.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/93703336324.pdfIn PDF document text
    • https://digicpictures.com/downloads/74452795263.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/92301891278.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/wepuzowukuzokuxudoxa.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/malevobivolunaviz.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/zovojizusaredatalevazero.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210902011330.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/bedifivumog.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/22190298241.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5463a780---buzikegegebasubo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a9f4b2b1---39545866658.pdfIn PDF document text
    • 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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 11012 bytes
SHA-256: df090608737202311a638176696bae0390e1cf15c0282d9d52f9d9bcb455f095
font_02_sfnt_off00012d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D05 18540 bytes
SHA-256: 459a3a02f34e80ef58f458a3476d9ca1de13fe4696467f833269c9c06d4fbdfe

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