Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a759824dea958d…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 06:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d73772052f67a6153db0176e23d8534 SHA-1: adbc1b76be9762366d5e4ac76ca8f716daf59ed3 SHA-256: 20a759824dea958d5ee6139b97526404a92ce0e49f8f16e65c8e701bbf847b2b
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a link farm pointing to multiple PDF files hosted on compromised websites, suggesting an attempt to distribute further malware. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b6f766cbc33f71b9085746aec1c36885/93133276761.pdf
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/xolexeneninevidakinidok.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2060a3fbae629182f7877bed6224818a/vapokemirojofokoxeri.pdf
    • http://stlukesmn.org/clients/17773/File/tilelibobesulareluxo.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/wudanofubaxa.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e52ef4d4790acdab91572639f9bb588f/jarapademuredolo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c59b9b393ffe7b310c6b9860265e6797/jomopi.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/54428807730.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sb4rb36qcmv5j0t23ht84p57hi/kigome.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba81cb8067---masoloworipuduvelov.pdf
    • http://sobsai.com/ckfinder/userfiles/files/91449745976.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d290e9f22b---dolozu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741c31a5c49---6840046765.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e8dbe51cd---melejipiretagafusanedoxir.pdf
    • http://funperm.ru/content/file/letewejomozodagikosegur.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6182feddbb---bitaluviwuned.pdf
    • http://healthywithhart.com/res/file/dowagofiwokeb.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/damifadotaxixorusikam.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/mabifikovoxavefizedis.pdf
    • http://bluekeydigital.com/images/pic/file/nadirefepumapuxopisezato.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2f84ca9db87859c8348dbd732519f156/jagutitowojagasesiwemo.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609440a7726de---kolov.pdf
    • http://beveragesgs.com/userfiles/file/nobidawumaxezonavi.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096bab52cb35---fekizefitidik.pdf
    • http://misosmile.com/upload/editor/files/8362382749.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cash+flow+projection+excel+sheet
    • 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_off0000ef5c.bin
13e2fd96a115362af0d8c70781d495e022ddfc0c119975b36c28247c947c3ce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10924 bytes
font_01_sfnt_off000108b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 16792 bytes
font_02_sfnt_off000120c4.bin
deee5dc5c76aea99a409bbf964c33517c548d272a309c5a6c70e5d5da531bcfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 17080 bytes