Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e9e29df18c5333…

MALICIOUS

PDF

99.4 KB Created: 2021-06-29 22:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1585a3b0920a618c3da583d172941634 SHA-1: 5d654e237a29af64934fb03e47eefea00179490e SHA-256: 15e9e29df18c533371466d3f45fb39f45509fa73ea57489f1c4ca80893d16024
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs pointing to compromised websites, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to leverage these sites for hosting or redirecting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://irlanc.ru/uplcv?utm_term=triploblastic+meaning+in+tamil PDF link annotation
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee338e60---ruzubagaki.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/76651237969.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a78592e4---fitab.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/43587903064.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098709575057---28429792518.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608082bf5fd93---takelo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/26493003493.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/rikenanafabiwimud.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/fudesuvebaxedomuvabifabu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/44383462583.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/givutugem.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4d0e2b715cb26952136acab1875edae1/mazevuwotibalero.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/bfadf066e73fb3fd225bb54e556801e8/tiloxinukepixotizulujewi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd9672678---xaxugebezinevaw.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/66217471054.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2e0f5bb87---21068181175.pdfIn PDF document text
    • http://cosmik-kino.ru/sadm_files/lozasimofemufile.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9668aa96d8af0edc2c9edd137dbc96bd/nuzomiwodibipagu.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9f48e565bb35198d137575e55cd87a60/dologisozavezutojiv.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/barozetasen.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ae33c799---zotokelivele.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72f00d50---rujoxujezuniku.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ab9305f0---xowelal.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/27866345331.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160923179ad79f---faralelinaxokupozufotide.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19ac56556---99333829383.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_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 22160 bytes
SHA-256: a767763b8dd39e743526af574f8a5faa434fd1aaf9e1bc2b76a242734d8aa108
font_01_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 10820 bytes
SHA-256: 535c34e4380fadbf4bf0bceb4f3eb83bbe660c0d03f8d0d35ed81e6e21f5e418
font_02_sfnt_off00014e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 17184 bytes
SHA-256: 89a9ba8bcac9960d0a7d3dbf62d8913721b64d087e4284bb8be1348549c2e3c5
font_03_sfnt_off000167ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1