Malicious PDF — malware analysis report

Static analysis result for SHA-256 50106dfe3d911ce0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 20:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d248df44b2829ec94037b464fb3c2fc5 SHA-1: 47218dc5b01d6a2996c88286019f1b41f5ef33db SHA-256: 50106dfe3d911ce0c44f9e782b42bcbc4126b7ea769b1f0f29aa9eb3c94cb5ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ketchas.ru/uplcv?utm_term=what+are+spider+eyes+used+for+in+minecraft PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e1ba6c13f582602cc2a52619c790b03f/10130476251.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/94235668712.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rajigisusi.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/muxodukifipeda.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32737885069.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/megisixefabusuxiduvepus.pdfIn PDF document text
    • http://geoman.cz/data/file/46785251065.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/9930222138.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/19911722786.pdfIn PDF document text
    • https://limsurempat.com/contents/files/vilabosipifegagebero.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/96870236700.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/49906017736.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/109838960.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/6290537860.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/vonelajefegumuladikemupap.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kejolikudigidojefepira.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428560a80f1---denewirisatorilidofuf.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/62228673329.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/1007240976.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8c2f696---82904843531.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/755e875c0c1b0aa240b0a71f627242ed/520882405.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/80000031838.pdfIn PDF document text
    • 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_off0000b469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 11044 bytes
SHA-256: 3e3abb3c383d42c4864283608028a33ef5098fea9f07e345dc486bc0458380de
font_02_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 15156 bytes
SHA-256: 875e0649d70ace31fb0e65bb10d03444051308c3f06a667123a984620229c4d1

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