Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7e621a6e98808c…

MALICIOUS

PDF

93.5 KB Created: 2021-08-11 21:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 48a7ae2c017a61adf46cb372848e58ce SHA-1: 744ba3c9c14056869c09957788542cdc1976d38c SHA-256: fd7e621a6e98808cfd47154a1d625773c465777a63e61b21c02afce0e21df061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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://nomylo.ru/uplcv?utm_term=can+you+connect+a+logitech+wireless+mouse+without+receiver PDF link annotation
    • https://eirai.org/editor/ckfinder/userfiles/files/fegagufewumix.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/megugededepufabumo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfadb1ec6---48709573447.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b090f04ec5c10120d1298267ec987ea/zusisojox.pdfIn PDF document text
    • http://teifsepahan.com/files/file/14530132184.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/89512885698.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac965de1dc3---48376712584.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893f182a60e---duguwewujegebu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9c1bad10---nofodanetuponebor.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/71942870016.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf204710c---49404189892.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160898b74c9143---jazozibunazopo.pdfIn PDF document text
    • https://tonitomov.com/picture/file/23174102662.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/porajofamuselusan1621770453.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5b0a996be5315ab84fd1ceb87f82638a/45874153801.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/91580337907.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/jomoxeletimewusomobokop.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/1275911241.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a1b39a441f3071528269df2934b384c8/xosexipafefakazizaxi.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/tivakenikenobananoda.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210615_5BB927EDA3414099.pdfIn PDF document text
    • https://blugarden.eu/file/46084101589.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/bezodepoxofizupegugid.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a063e94c4---53415066630.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 16144 bytes
SHA-256: c595351a95a8241194bce02d6b8c3f73df3c7208b5290288c00c0827ae6bf609
font_01_sfnt_off000105f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F7 17672 bytes
SHA-256: 878a9ba5e0ebab0a402c59f0667e1616f9e77cd8871357910ab1faeedab837b6
font_02_sfnt_off00013478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 11076 bytes
SHA-256: 4874ae66d2c5f024ed679cfbc9112b6c1a4519aa55ec65182e768a0d04c21045
font_03_sfnt_off00014e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1