Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e58720010d14924…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 17:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09aefa2ea30e21d5ddc111782916a475 SHA-1: 2f30795d297daf3eedabf7c98ee070fd4316dcf6 SHA-256: 4e58720010d149243c29221c7aee7b111c987b677708bb451d757f1b6ccbe527
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and other disposable hosting. These links form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://pixomot.ru/uplcv?utm_term=is+67+a+prime+or+composite+number
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/xavipatujawemavidiviwew.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/gabebojofonu.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002e7d89ff---52833051298.pdf
    • http://thetestmag.com/userfiles/files/bazuno.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e23e58cc0---94216629936.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161410b92331a2---nenanonulabowapapikesinuz.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6517da48---lopigajupesezobi.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/zimogetut.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac129b59---jipiserapugixusosadi.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130289924127---vofarunomulawepukazad.pdf
    • http://fbrasil.com/userfiles/file///mamazod.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ad6356b4d30b267f6de88bb081dc3843/18648987308.pdf
    • https://art4you.sk/editor_uploads/system/files/75827295724.pdf
    • https://siemreaptraveltours.com/userfiles/file/joledovizel.pdf
    • http://ambcavallon.eu/userfiles/files/56843492067.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/57012825426.pdf
    • http://chinawin-consult.com/userfiles/66929582892.pdf
    • http://1-sanya.com/blog_images/blog_/file/29513839809.pdf
    • http://asqcert.net/files/files/jagefiriwubatorutoban.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/didimigabulusis.pdf
    • http://vibestedu.com/_UploadFile/Images/file/pibalezogir.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426384265b---56502572400.pdf
    • https://hotararicedo.ro/files/files/wasutimodekezedotani.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8d.bin
8e2f5d89e019f5910822750ee39bb9a984f884d295d20bde743c846e76989d29
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 16388 bytes
font_01_sfnt_off0000e794.bin
d35aa1cef25d30e254d6b1f68f358d0caa3a997be54ed1da6ec0b6d09b6520b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10900 bytes
font_02_sfnt_off000100a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 16792 bytes