Malicious PDF — malware analysis report

Static analysis result for SHA-256 b946e7eaa3cffed4…

MALICIOUS

PDF

86.2 KB Created: 2021-08-10 21:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60635293fa3c0c4f2f64174844ab45f9 SHA-1: e4fdcc4152d419aa4e1575e086f134762ad2724c SHA-256: b946e7eaa3cffed46f960fc657f2e0b2be327a26777d9668a0771007d39822db
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for redirecting the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=2017+suzuki+sv650+service+manual+pdf PDF link annotation
    • https://manenshop.com/upload/files/tuletupinabajapoberiro.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-30/images/files/muxudofoxufexemazekumedon.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/xedajefadiwubidijitavotir.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/pegaxa.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/2285471838.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/37154401718.pdfIn PDF document text
    • https://guijek.com/userfiles/file/55842327132.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5bbec5dae7659414f8e85fd0ce03306/sixoju.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0767a022---91262342516.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/pubupofasivosojopuleropef.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f217ab2aeccedea2a0365125e7efa513/disivejapisinofebi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jn0cre5li65br6ig8ksnn5vpim/bupitosiwevomo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e387d17e9a5---daledulofidavixel.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/38399897132.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/judavaxegowazigejo.pdfIn PDF document text
    • https://fishboat.hr/files/15010652878.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a19be61b5a7---66198709811.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/67dc355842a22497715b26364f679bdc/wunijivubazugolawul.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a60ca7145---dupijujavowosijib.pdfIn PDF document text
    • http://exima.kr/userData/board/file/44272031648.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/en3i3hsc36snhb91ilsoil4203/65633857141.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/18835216259.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779af689093---88482742060.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/7646947125.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/pemojumuduvemupipojuvage.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f399a13e5---32275630051.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/baa578038e6f58acebddbffb88217111/juwove.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6ee3d49b---365554847.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_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 17164 bytes
SHA-256: c777d2ebb29ff241e48e1eb4b76c9d2e87d2c4a2b9a43fcc8703ebf1c3910ac7
font_01_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 11432 bytes
SHA-256: e22efce6920abd773cf96c227b135c1a8592dfcb8be589a300be0d49e988c087
font_02_sfnt_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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