Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54c396d34ed158a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 16:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2c27d831863810ef56d429676a40498 SHA-1: a2d03bef2b2422a56f82e5d7de81a4690f9d81a7 SHA-256: c54c396d34ed158a8fc619eb69712d04637d8ba84ed046a35eee68d800b24d74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to redirect users to external sites, likely for phishing or malware distribution. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vatlieutaphu.com/upload/files/zujulufututefefoz.pdf In PDF document text
    • http://koyomisushi.com/uploads/files/8951213964.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/savej.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/zikexenavepovesogiva.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7efb41824---40326841180.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/komivowetifivuzav.pdfIn PDF document text
    • https://norservis.cz/files/files/volufozaxufudulota.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/winebiberidonixamumimimis.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/91145303835.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/rinutoloza.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/1674693302.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/1297794023.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/lezutu.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/97978140502.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/wasovidanasulumo.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/83654215035.pdfIn PDF document text
    • http://hingliltd.com/userfiles/jemosokazozigiferive.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/27786238285.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2torf2uufmb87uav4qf5eh8nv0/totemumowukidonafupoj.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/57171924050.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/wobudutalosafomopefov.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902105613279.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/sixemujozerukudinoxogowa.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/46c247172e49c678ddc58572f27c89f9/25287779827.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/95518311123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+vice+city+32+bit+windows+7PDF 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_off0000bbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD9 11004 bytes
SHA-256: 1a931e4d2f7c3e03691ee0a4d1f6bc52c649cdccdb6223706ea2d22e15c404df
font_01_sfnt_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 16700 bytes
SHA-256: 7a98de1945a427988dcb6827ab099a125ff8edb42f155b086ca35e0008a9001f

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