Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5df17f32d00d16…

MALICIOUS

PDF

87.8 KB Created: 2021-09-24 03:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bffa316a2f28ea5c9a73ad7e855f5714 SHA-1: 187256eec789b32d3506302863c514916ef6a75f SHA-256: 5d5df17f32d00d1606b5dc68444373084307a833bb6c128bb65107198cb83000
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to various websites, some hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://recit-de-vie.fr/userfiles/file/vozajafivoveto.pdf In PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/47332102a30367fa603e40e2db64cb16/xijogiwulowager.pdfIn PDF document text
    • http://npas.ru/pic/file/lurugijasuxetar.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/bogafabotetujapivinixefi.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zasodafagejegimurofo.pdfIn PDF document text
    • http://beta-rc.com/upload/files/naratezogaxujeba.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/62231708359.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137c17243f68---gerinoxinubidujorifijeko.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/517336834613d955617039.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145adab29aed---50044914330.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/niresitop.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/29893283664.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bonositupofij.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/geworinejuxidopamomo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/32048052680.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c973c6b9268e672dd56e68119140ca31/90097765004.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/tidujuvifuladavijigepo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/fad256873fc1aa715e8e09732870b87a/nomagaraligewegudupafug.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xivezepokugugeditumobim.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bb8c984a3---42421417506.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd80f1e08---manumisifuwakefiwokolidik.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/63151108371.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/vagubuzedoxub.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109072152418846.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lawoxuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+the+bachelor+livePDF 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_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 10256 bytes
SHA-256: 542e87e78e89f2e822de068d6d39af9258ff69718447da1ea21c0f0d359e80d1
font_01_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 17252 bytes
SHA-256: fa8848d2067b072d033d74fc4b7bfe59e44609ea6b4c49ad8e6cd1177f4fd5c4