Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80b36f93524ac5a…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 09:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9816d58d425b9414fc9bbb80339c644c SHA-1: aabcd418cb3198d617464b5a697d4e5e2fd65a58 SHA-256: d80b36f93524ac5a2f0bfea76a304830ca0578f81169e448d9e6644da8430e26
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's intended to lure users to malicious sites, potentially exploiting client-side vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=harry+potter+spells+and+puzzles+apk PDF link annotation
    • http://szigmetal.hu/editor_up/pekilitevew.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/rasisitidalibolonux.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/zivefeji.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/disox.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/21722620126.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/76771287842.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908080530188807.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/balop.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/71697629817.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/66890609153.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/2925873302.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/bipafenasizugavugudukoju.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/82352852332.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161425b69c765d---jokumomudek.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5qlt4ahb1gnnl5uspdljdfr61g/56112143510.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/31667654262.pdfIn PDF document text
    • https://dm288.rs/slicice/file/88488769215.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/jitisonanozolalotu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/19128515657.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/futivinoromevujovagomun.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/48133468451.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/56116898358.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8b09d4ac1---nipalilozusazoxune.pdfIn PDF document text
    • 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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