Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5737898f2b5882…

MALICIOUS

PDF

80.3 KB Created: 2021-08-23 14:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 389180f25679391a7fa06d29cbdfba41 SHA-1: 3e701ebfe6d14ddff9b3e87a5fffd62e79cb7f82 SHA-256: 9e5737898f2b5882624d55304c74c591017cd74e7b97fe66b3574ee5bbc3b783
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=application+letter+for+a+personal+assistant PDF link annotation
    • https://cryptobasics.biz/uploads/files/judizezadagowu.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/wibirobafanagabola.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lewidinolubezavixumiz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b94a02e4---jezipotilaporituzanewob.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/30078500336.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd10bff85---poxuxam.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/17252321982.pdfIn PDF document text
    • https://uangraja.com/contents/files/93312846394.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/42080277050.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/jolibixitav.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/40969311858.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c0dba5f8f---53804387891.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/58r051qj5ahfqfbcsg1nbf3na2/38742718346.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/26238487705.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/lixosiragofene.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a240746071e---40381951931.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/bg05e8s9bl4rube1kiugs4nlk1/52633230283.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d5011df5c1ffb530f59c4c5acf4c14ab/ririmad.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/fozavaxudamoxuzam.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080d61bc63e7---robomananolali.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/48776991939.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/xilerukapijolemaban.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/busolufi.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/f0142ceae8523b9afc5b340422a50fb8/piguwiboridudiseg.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec17e135d9---befivatewomizediripelepi.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/dasusakubotirupinebabonad.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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 16380 bytes
SHA-256: 2286e5314f0a8b3f836640856923f6d3029ad4c3a9305c0757e6ccb624dda8a4
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 10452 bytes
SHA-256: 507dc93cce9a5d5452a875ac2a963fb9e2b1273a1d3c867125c9cdbdb097f4d5