Malicious PDF — malware analysis report

Static analysis result for SHA-256 513aa2fc44317c5d…

MALICIOUS

PDF

65.1 KB Created: 2021-09-12 11:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 333452bcbafe3a1a5cd2ef1739028353 SHA-1: 262e7d2f2ddd356bf116c0f54cf3af12b819fa20 SHA-256: 513aa2fc44317c5d5f6f6acc1e1cca6844bba945cdf47695965ab3d2465aa574
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or obfuscation of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 6

  • 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
  • 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 http://topup-fight.com/ckfinder/userfiles/files/54733778777.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/nukoxezametedazobed.pdf
    • http://unionnutritech.com/upload/files/58544601927.pdf
    • http://falegnameriacastiglione.it/userfiles/files/gevoxulanijikidujexesin.pdf
    • https://tecnomatec.cl/upload/file/39495392400.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306edabfabe---36689832473.pdf
    • http://szintai.hu/ckfinder/userfiles/files/vegadameboj.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/wesupaxufinupexizule.pdf
    • https://congnghiepxd204.vn/upload/files/71557299485.pdf
    • https://anmoul.com/userfiles/file/15802371868.pdf
    • https://palet-school.com/files/files/wowanofebudeg.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/35741304769.pdf
    • https://wspaperbag.com/userfiles/file/rugajome.pdf
    • https://suruburi.net/mm/file/giviwasebovavudunoki.pdf
    • http://dralituncer.com/userfiles/file/pigudepurapon.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/7900915695.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/70729766160.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cc41cd0c---joxojewu.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/megerub.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3c229a30808e73003eea69e7ad15f215/dimonav.pdf
    • https://responsible-tourism-alliance.com/content_file/files/gubenetorezekulojepavebu.pdf
    • https://pharma-tools.eu/galeria/file/bogunugidijimekesokupaban.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/dopov.pdf
    • https://tlproduct.com/userfiles/file/mugiwovufadazexofitife.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=shaders+for+minecraft+pocket+edition+1.16
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf51.bin
cf08d0bf95a07c76402c3b943d4ec464d3b29f32c56e93f340b546e1e12f4cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF51 11292 bytes
font_01_sfnt_off0000d9b0.bin
e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 16632 bytes

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