Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9b5f30873e7016…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 15:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06c9024d2f0e0315332cb46da6d0ed7f SHA-1: 387e8cc1df987185a23c2e27c5b8cf430ec9a5ee SHA-256: 8c9b5f30873e7016ba8818164fdf295566eb6436bd0c058e6b68c9d933b42040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous external URIs that point to potentially compromised websites or disposable hosting. The primary attack pattern involves directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://szaniterplaza.hu/ckfinder/userfiles/files/novamobutovexasukoxeveri.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucumukv1hqi6fstf7174s92on7/61385069508.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/67924769000.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27e8e73c52bfd219837646a1549acb1c/33249621492.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/61750879882.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de2886f5dd---84347247122.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/83573501290.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/50115566526.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/63543264042.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f089782ae25---bakemaxepulusezovi.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/31542025104.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/tamigokiwugozufaxeviworo.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/firevunapumowojo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a036f0c2382---vibipodukoxukiter.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/97333896505.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/60916350233.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8eb27911d5ff25cf8221cfc9b06d05a8/naniwodowaxokuzume.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/17752369496.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/6612931054.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/78263845256.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/dejupiwob.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098395bd7b4c---68932663068.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/76173fd7c5f298f93902fc3b36a59fbd/rujikituledunexegiroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=andromaque+r%C3%A9sum%C3%A9+court+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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 19352 bytes
SHA-256: 2d41fa2c7115c59a2baa415ec0fd0aa1d2a33110dece2f87b37f592693ff0171
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 11024 bytes
SHA-256: c32f8b673380ac08674c8c96dd6739c4b3420f99e431c70511dde32d609fee55

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