Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3392f7a2f74411f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 14:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4de6d34d519f363a8b95fa450bdd64ee SHA-1: 9994e8a854b08e4d724400da7860effd5ab47150 SHA-256: f3392f7a2f74411f3627725781a1be9a2cfa307b5b8779ffbbce91cc7524cc24
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update to view content. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, further supports this. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to deliver a secondary payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=how+to+connect+android+to+chromebook PDF link annotation
    • http://twfindia.in/userfiles/files/vuladu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b679cae1---85161161676.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/57952734236.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/14665031013.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/95365551278.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/50502250446.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/boxunukej.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c17da0a8f---matonubukiwixiful.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/pebofaza.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/rijokebev.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/pevifufugutojolabipulizuf.pdfIn PDF document text
    • https://proia.bg/userfiles/file/nexaperizepuxa.pdfIn PDF document text
    • http://abnicum.ru/files/file/50321951057.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/nagatoxefokemen.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/susolemiresogorozivamijub.pdfIn PDF document text
    • http://sparkpro.lv/content/file/50973660268.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecfdbc18d1---56188272029.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd35b860cd---41137892501.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c472394989---regarepefovogovok.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/45195545962.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/dorabomigi.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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 17584 bytes
SHA-256: f96da09b2352591da683f9a5d0016b4aad127773dccfcacea1b0931d0db399b5
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385F 10728 bytes
SHA-256: 2734ca63e712198cd3e157bc122018291c28ff03016c16b050ab6fe9a18873a9

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