Malicious PDF — malware analysis report

Static analysis result for SHA-256 98556ef614b19c63…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 19:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c65d99e760446bac9ed447b4a662a02 SHA-1: efb22bd042456e53acef64558001c0b40d0d980d SHA-256: 98556ef614b19c630ce07181f536eb868cb5f09f021c3e874fca1b4a1675005d
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for executing the malicious content or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7455

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://chcial.ru/uplcv?utm_term=project+free+tv+bobs+burgers
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/41923256015.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sotigupududenuzufazopilel.pdf
    • https://steammining.com/userfiles/file/1006492798.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614464f189c88---jevajape.pdf
    • http://tuzvedo.hu/elemek/file/zudamuminet.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ca602b3f71a1e4c22cdf8890b39631db/vojozikufaripawuwow.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/devexoligelenedi.pdf
    • https://amrapalispot.com/userfiles/file/41303714357.pdf
    • https://villanakarin.com/userfiles/files/37938047473.pdf
    • http://preiss.at/upload_files/files/19011367661.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/33858649726.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353ab65842e---ladomusewifudutomowub.pdf
    • http://bitree.net/ckfinder/userfiles/files/widomulipa.pdf
    • https://girisimhaber.com/uploads/file/kuvodavowazixo.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/wokuwagabirefigef.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c16qj3cirtr28vlaav5et9ish2/64233640863.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/776f3e993ee1689fd453231773cd6681/javapupesezujazosonekesu.pdf
    • http://szyuangang.com/UserFiles/file///zifegaxuk.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/gitel.pdf
    • http://skncn.com/u/files/wodakalagilamaluxob.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210912_BC31AF500B76E1B7.pdf
    • http://sitarofindiamd.com/userfiles/file/5274851651.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013196.bin
afcb658912e079ae5d30d3511df0f89cbdf3af4beaa22ea807169d7fac97377c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 10544 bytes

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