Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58bed5ec40c2b6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 00:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71b378a50c8b9971c1aedde66f62a618 SHA-1: bc248d39a26eefead78eaf0d9d3cadd2b81b1d30 SHA-256: 1c58bed5ec40c2b66b120b274648c1428dc44529ba8db357add1b6d834b28b68
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6300

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 https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o7dpoklejji85t56jtj9699p4u/51034519106.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78946531c0---51078519262.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c342c5965a---wejokoxoponiwofoj.pdfIn PDF document text
    • http://jucal.es/images/file/22858627182.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1a82b6010a42e9f46165ac12c3b3c1b3/44538201372.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/7774836738.pdfIn PDF document text
    • http://garderoba.sk/images/_file/63778514420.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e50f806fc---90239140474.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ea610432b1b1c971b2107be369dd4773/jalejom.pdfIn PDF document text
    • http://ed-union05.ru/files/file/29739512489.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/jaxagi.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/39745567709.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8134a3f34181ef3c5daad212666a9db6/54052026717.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/20863078783.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/37366114972.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3ce2f0af---dabixopifuxamuwu.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nizomutesamavefaviwurez.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54d543d33---xevulalozojesubokukozefar.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/raluxowasapefasivizezuke.pdfIn PDF document text
    • http://cmtsport.com/pliki/surarifigepagulasidun.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0sojephh4ltbiisn286nm7r8v2/41174833823.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/buremogabis.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v0rmh7jsm8ciqu7gs0af0d5qca/95490025072.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f0a66f7d---romufo.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/73834600272.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/1034876154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=software+and+its+types+with+examples+pdfPDF link annotation
    • 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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 17144 bytes
SHA-256: b5ed3ef16908aa21903db81d912d1c15afeacf8330b790f9571b9e3275849e38
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 11140 bytes
SHA-256: 255e90ee3b987c519991a861441f75b8c034c3ad7edef6b078a69bf0839249e0

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