Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae7c78e269dfb55…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 05:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4adfa60965121774a7205959333727eb SHA-1: 1010fea820f55366af389100dece136e6d7013d8 SHA-256: dae7c78e269dfb550998e79d46f37ed031cf1f0e790690a55b14730112e21d9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nscenter.cn/upload/files/bulukazazezirevi.pdf In PDF document text
    • http://biznesfishki.ru/files/userfiles/files/sonodolixo.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/98821251638.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8faf1b99aeee806106c7a680ecb96741/16656834726.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/67438787573.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0becb8dd4---42074974774.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/20297973211.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5a8b6fb2359cd620c59ce3ceb82a6fe8/zuwomuj.pdfIn PDF document text
    • https://tadimtursu.com/image/files/46076117798.pdfIn PDF document text
    • http://hadt.vn/upload/files/sezewafivi.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/56967628518.pdfIn PDF document text
    • http://kodemari.info/data/files/bimizawumexezuvilek.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/14990040526.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/kavumediwovugusi.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/67419851063.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/sadibudowesepuzam.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/zisufariwafisijozufam.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/zofup.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/gumaliso.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/17724707323.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/4787398242.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c69333ed---35070315590.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/jaromanulesagiko.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614223b9d11e0---75464614963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=die+hard+streamPDF 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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 10244 bytes
SHA-256: 8ea19e4f4651c759262eec676d4e248ac6b222bf717033409ee9a4adf682d825
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 18608 bytes
SHA-256: 20be3aa089c14834bed6cec1bc28bd8c35f8c37721daa9029b5db5a86cb93aaa
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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