Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c20f07380445a73…

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 09:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d807f8350f4a1bcf09c734f13830e797 SHA-1: fcafa947506f07e95aae13e62a97b684e91d2ebc SHA-256: 4c20f07380445a739e8daf3290b9244f7e636a633b1f9ef48905b03922d2a9a4
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common social engineering tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=buku+pancasila+sebagai+filsafat+pdf PDF link annotation
    • http://giustizianuova.it/userfiles/file/33854474735.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/46998859038.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/60998263667.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc83eb2b8---57443567994.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/sebotorotizanorazasuxuf.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/bewipebop.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607196a670bcb---76659368127.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd66827fd1---5952810606.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/82246475848.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/67209668551.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f40mcl0m9gvo9n9lg0nkla372d/17823702292.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/463b0d28c228ef0d0f59a88c1e30bac3/59246814368.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6f2cae1b---lepajekigopabigava.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/67657367308.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/07/file/20210907_191733_186.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202152335340.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/62389719937.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/53277782306.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/41799173923.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6c9c3f7de35671fefb46adc30fcd20d/lupomutekowuxodobu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fitutifazigelinorakokel.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9703edd5---wowuge.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/85117455117.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ff2759dd---58162533231.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_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 10960 bytes
SHA-256: f01c2157d3576f2bd8f0eda4687257e1ab660f813082e78eecd8c63cdca4fc05
font_01_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 17648 bytes
SHA-256: 3ca668310dad0889969e0ea889e589d34f5a72f41e766be6e4eca08041d00a56
font_02_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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