Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3af17dbcc18834…

MALICIOUS

PDF

88.9 KB Created: 2021-07-15 12:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 360a46ff1d96b17f55c1a80119d239be SHA-1: 0d03289d31c1a1e411d7d58d787c3a6b6db1f11c SHA-256: eb3af17dbcc18834cb1588c7a61a5b67d04c266f64d7c109951fb4d13e248b6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to lure users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/eda2556f8dc2ffe8df0911f349ac9600/letotalajuwuji.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160df7efaf0db9---zifenogenisivemalo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c8cac08d---37218255761.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/pofejeruwebasi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061523375010.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdc6c76f2---1716186779.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/44563747705.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3f8a525ff---10266276959.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f204f193f8bef5aed44e327740c0324/rujuwokokoti.pdfIn PDF document text
    • http://efrex.cz/files/file/xiror.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/julemutopixijejomukula.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/futalisudofofane.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3353ddf3619e8db7248e211562e315b5/30718736981.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607090814905d---raxobipimopomozupi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/susujodiser.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160838a2706981---90677417474.pdfIn PDF document text
    • https://hirurgija.me//files/46097790696.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160758dae9c81f---41167771635.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e729c7f8b6---86277805172.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f7b6f513---wanukusigarigufaxed.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e574493b---55147205102.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/kogepixufomalip.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/88869867153.pdfIn PDF document text
    • https://chp-travel.ir/data/file/60572853003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=example+of+an+ionic+equationPDF 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_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10704 bytes
SHA-256: 76e02dee3960a4afc6c4a8f1d9bd0084a11c4c79d6e548c6838718af9e37f25a
font_01_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 17244 bytes
SHA-256: e0dd9bf1dd360ee901d7271511f8dda05a9bd5e81a72e04244ed972ed9771b08