Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a17a25c4ce346d…

MALICIOUS

PDF

56.6 KB Created: 2021-09-18 03:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa7b5695bb5af4c7b271d67ee2f728ed SHA-1: d9418c618ee489977429dccc69d85f24342419f4 SHA-256: f1a17a25c4ce346d74badb3bf184cd0485949897e2c9c43cbe64f970220172be
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external URIs and the 'link farm' heuristics strongly suggest this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8091

Heuristics 5

  • 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.
  • 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://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/bebawitaxevi.pdf In PDF document text
    • http://sanyosushiglendora.com/uploads/files/kejipiwarekiwali.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cc959c96---72343658103.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210909205809721721wof16sjx5itd.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/karolimuzesoke.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2bdc499---70021414733.pdfIn PDF document text
    • http://prompol.com/media/file/tipoka.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210915163459.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lometaso.pdfIn PDF document text
    • https://remini.hu/userfiles/file/71856456463.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/55669864731.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6ca06aed04986da4605404d11daee485/36188849202.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/57646511276.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/19776611773.pdfIn PDF document text
    • http://rcmo.ru/upload/files/natobufabobinolodofixiliv.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tamubawutupupewasalakud.pdfIn PDF document text
    • http://cjatkinson.com/userimages/nujetitesaxirariripafefip.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/35241736834.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/bivadon.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/24131678814.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/86749036947.pdfIn PDF document text
    • https://deepex.hu/hirek/files/57327909495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=alien+shooter+mod+apk+unlimited+money+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 11032 bytes
SHA-256: ea7af24f902ebfe7e3f866f0286beffd40913f76f93b86fe70dcec76d29bbd3b

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