Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0b0e45a01b4477…

MALICIOUS

PDF

73.5 KB Created: 2021-05-23 15:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94066dc8b31c7a0901a06f78be161f0c SHA-1: c22e39cc0ed33b185914bf345ea64fe3ffdde050 SHA-256: cb0b0e45a01b4477f139064a8e6c4096726fda3b83cc3f6feb0243bf5dc77281
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8886

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 https://krisoc.ru/uplcv?utm_term=five+nights+at+freddy%2527s+unblocked+full+screen
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c725e3cc7a---kewamijaxevavagilu.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/dezovulafamidevam.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a352d17b4f0---41290279904.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ef08edn4epc1rcpakh8sc6k9oi/95474084456.pdf
    • http://amoy-art.com/Upload/file/wamokomoxixapase.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ugui99ejpldkb86d6ci961qth2/volulotirubibibemoxebe.pdf
    • https://triosms.com/userfiles/file/litonutev.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1659b70bd34efff76aa18f06d49cca2d/pubifomivuwifevaguvunizi.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5917a00a697e2403b7612c7a749515b9/85636314919.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ghl12kar32vg9ehvq0v71odrsu/pixarebawarojutivela.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16092d70b92415---rakemajogimubajumavogisex.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160871c16d2fa7---22991363697.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e93b5bb67---tosederodupaboxurolowuxa.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/2da4c05a4b8c58adfd1d8ec2ec0c7c4d/37704312380.pdf
    • http://szao-spb.ru/images/news/file/63890641608.pdf
    • https://ludifrance.fr/userfiles/file/jalibejitexaduf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001163d.bin
3847835fdd79ce327a0f0476a96a73b89bf69440d76968b552cb71fc9d515d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 5640 bytes

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