Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28985d467e3afcc…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 10:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 159fd53eb0b884e05cc749947752acd5 SHA-1: 349d63ef315f662f3621197fc9eb2d4baf9eb500 SHA-256: e28985d467e3afcc82f45cb62c9c7155879edf5e3920c36da23021b0a81c38bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded JavaScript further supports malicious activity, likely for obfuscation or to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=how+to+get+neighbors+wifi+password+on+android PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/98bf96e36b50515ffdf46e0312f93af3/wawova.pdfIn PDF document text
    • http://www.agot.pl/upload/file/50775909884.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/wuzelozafitoxap.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/gilerekatatowagumeje.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nefonusutilokovexogovanum.pdfIn PDF document text
    • http://strahyi.ru/images/file/13588416736.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/10993357889.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/lurusurenotel.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/kiwaxegepafipide.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/gikogunetijotak.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/1091723229.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/93645818946.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/211036810.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/49208945303.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/72df9a7c7e8b781101f6c93bc9a7751d/jutiwin.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/gilozebokege.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/19499436862.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/dovozatelo.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/sosedaxi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bbbc156ff64a74514ee4cfb0655d23ed/47409619186.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/59275489094.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/87736572522.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36204028e---dezovuwuleno.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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 17752 bytes
SHA-256: 43f9f9328c3129ef3498ebba475b8e7ac952fd81f7fc476f2f10e3476f069bc5
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 10948 bytes
SHA-256: 690adeef0decfced43baf9ffd6623a3edd2b2499eda5341e0d4421f627640685

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