Malicious PDF — malware analysis report

Static analysis result for SHA-256 a919d8384d0e2812…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 02:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 113921fcd2e41ea3f095ed81daa969ff SHA-1: 464350a0dbf841d045c59769f7b70e0d8957dd9d SHA-256: a919d8384d0e28121b3ffd5b550f0e6018e2a2b2b28373d90470b4dbbf5aa6f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, forming a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for further malicious actions, such as redirecting users or executing additional code. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://digitalpolicycouncil.org/imagenes/file/kijoxet.pdf In PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xogogojunog.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/91152543792.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210903_220527.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/43718518472.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/48064405160.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134264ea2639---4849841942.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/90739548729.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/35541804129.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359d08bbc57---sivosonututume.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/52178116832.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fazepinajakup.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/70260672671.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/tuporodisogilurutum.pdfIn PDF document text
    • http://clingac.es/d/files/simumovuwaka.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/45037464895.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f5abac46c1fcafee40b14d05e59f7280/puwujuxezadovagopipexug.pdfIn PDF document text
    • https://thepainter.asia/upload/files/15262351770.pdfIn PDF document text
    • http://prota.ru/upload/files/43627651895.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630957427.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/tawaribixapoboborupipa.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/mafazudakunemo.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/tubutimozexefivokukipu.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/wijumegix.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe54eced0---palamizuguza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=generic+structure+hortatory+textPDF 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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 18620 bytes
SHA-256: d7b541959bfeb0df1c78968984dbb8bc8583c9d5f926b6d65dde2e65f74319d3
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 10636 bytes
SHA-256: dd973696a22073a1c7b8e89e52d632190d5ce134091305ceaccc15c3548ab143

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