Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c62cf1e6b2eabff…

MALICIOUS

PDF

79.6 KB Created: 2021-07-05 09:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2747508e5596ecdf3c81d7175090e5cb SHA-1: bb6871e0d390c9ea27c58d954b293c69bbe0457b SHA-256: 5c62cf1e6b2eabff6cfa096b1e9caf136c219c8b8bedcfbd30f0914a94ba3158
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URIs pointing to compromised WordPress sites and potentially disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to deliver malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5698

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=treatment+of+staphylococcus+infection PDF link annotation
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v9mf6694cccj1tm69da5g6cp11/55085069603.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sng1kt9cnbq31ivhj6b5b6vief/86236631534.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/01ihq6jghp4n8p300ifmamin72/xerodude.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294c7eadf8---gegatataguzeju.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/87021330998.pdfIn PDF document text
    • https://unosms.us/userfiles/file/24732719258.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40d6dd87b---52603994993.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/33780401433.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c693e2ebe35---pagoker.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/tosiwukiripira.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/nabuzoponavidoxunurik.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bifavapuzova.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/meobf3atemv3ldqikdf40bna91/84324367661.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pomorelaxobimor.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/giliwabopiwosuxom.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/lugiferazomujuxaxa.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9b49a4a1---morokudizigawuxewidunaw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6039de3f---6385990318.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/871edb68bfc714b5bcc93a235370001b/lijizuwijifila.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cee6e3f45---wutowazom.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607e144b04fe5---95412723923.pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 10920 bytes
SHA-256: 7fd21cd1c800e05591cf8c124a1389a712341c1bbda3f74f63cd8d16342334b9
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 16876 bytes
SHA-256: dee8be39951d86d6d1327283daf4b39c30373ab9d496e95101d06f5bf0390d66