Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeefa50e093659f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 08:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 328082fc1084ef9cf86b592381ecd469 SHA-1: 4468218383a3a65d2733dc4feda6aad9e87209d6 SHA-256: cbeefa50e093659f9a4bd1f34f9cc99c7f5eae15475475299b78ec8b44007f9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of PRC/3D content and the overall structure point towards a malicious PDF designed to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+can+iphone+and+android+share+location PDF link annotation
    • http://tehpromyar.ru/media/file/63807113763.pdfIn PDF document text
    • http://thepducphat.com/upload/files/bugizulosezinup.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/24703389269.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/kozojikirinubi.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/27439464892.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/36178277805.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134106097317---72283972142.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/vonisefev.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/r79fq30lht6a4pu7bv99j1ogdb/61239129410.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/54986303021.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/gomugemutun.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/14812030244.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53537542703.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/vaxorirejojefukegomeninar.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba98a2597d---81184825542.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/pofexoxaguwuwivifudaniwix.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45758291578.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/10388022480.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/vinorigasig.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/43557636206.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149640b2085f---31967215863.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109020920425062.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614077ebf3b47---69384182206.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/kezanovajipef.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b2eef8eb387762aaeff83ed51da65632/29205649871.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_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 10688 bytes
SHA-256: 70482a046f98e7bdd0ca53419d8458afb2b840ef604f2de09d9dd7c877e78882
font_01_sfnt_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 16640 bytes
SHA-256: 698a3ce4108c721d50fd2eacb10a32084493042ee30fb9027b35b33739c1b52d
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.