Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd2faed20644179…

MALICIOUS

PDF

90.8 KB Created: 2021-09-08 20:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7ebcc378a42f627b2092ad8c506f43a SHA-1: c29060387c08fa49f05b15203e32c430a75aec86 SHA-256: dfd2faed20644179e2fb2b35ab81650a48805cdc4a84020b677ce2bfe9d751f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://bellina.pl/userfiles/file/78083134816.pdf In PDF document text
    • http://www.moyekolodin.com/files/48834897240.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/paravivesuneju.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8f456689---misagafizagu.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/93455620583.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9fefcf3b9db58e290ce52d6990269a29/4311545555.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109012002283097.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/ditavudegofos.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/11548296947.pdfIn PDF document text
    • http://bastola.org/userfiles/file/8850289733.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/wisesifizibemugudodade.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/kefofera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598c20eb78---44666950166.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/81063267343.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f5831dce---27462734152.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kosar.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386a229afbb---20124447156.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109070156596372.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/87lk8inob1a1irascdijncnamn/96238653453.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/50942641852.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xuribobaxapi.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/19641824333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ancient+egypt+quiz+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 18364 bytes
SHA-256: 67d26c1cc7b97a25f426fafa830057e467bf0fd7b471afc47ec9caa9e9f02ff4
font_01_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145EB 10600 bytes
SHA-256: fbf7623966c1f8e6b14a5b54844de6a773f7b12f7fdc541f77f28cb1bd307418

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