Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c65899126095e0d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 05:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f1c17bd24e1d289d406aec0049030618 SHA-1: f5afc5feca39fab1ec910114e12afda0fe7728c9 SHA-256: 9c65899126095e0d699633938c36fd6cd326bd294e0139365b229eaaa95aabdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d415576c4---jetenefoneboguligirox.pdf In PDF document text
    • http://mutitar.com/user_img/files/fizosotamowu.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/zikelorexubatovito.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/zovarisisomu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/tudenopepilodubun.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/gitopo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/siviwimetolibejizotugexoj.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/81990613235.pdfIn PDF document text
    • http://fabtur.ru/upload/files/gutopaboz.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/40240971604.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/55839010951.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136491c8fc2b---34261473074.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/49057611078.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/90373204689.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/peliwudegixe.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/datanux.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/vapoguvurulubuzosamodaz.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/79075302495.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/menupozet.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/34346164261.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/89591830573.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422961788d---wogozunedixirudor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4da64d3b---68635033820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=incognito+tab+shortcut+keyPDF 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_off0000d868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD868 10860 bytes
SHA-256: 47f227734d0ddab8d57fd3de10ebeefd04cf5d48ccf304544b8834d3c78f17f7
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17620 bytes
SHA-256: 240bf4676de17cf6691e66fa9919570f7860afcdab7a7a177ff20d4f4441a5c1
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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