Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb05cb052911bdd7…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 20:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79da2cfb7820cb945afaf1c2aad20927 SHA-1: 5461cf2682b136a8ab37bec77c21a05ac2e1d217 SHA-256: fb05cb052911bdd7901fbb962ed3e9be2769141a8541fe3ed1380e8bd9beaecb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=criminal+case+cheat+engine PDF link annotation
    • http://laboratoriologos.it/userfiles/files/92595110523.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/neluzekonuxafezifub.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363cec1173d---66158497299.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/xuxuguvutonexuzu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/62049269794.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xofemiwojiv.pdfIn PDF document text
    • http://asqcert.net/files/files/kotitimokavojile.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/fusejajokawa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302a8675492---57099192335.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/rojaxuridavuwepeletagi.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bopizadujokiduta.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109021545244639.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kebikeberabunude.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/49425424604.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/xejavetezilulozizonan.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/lelajugonafugemebomado.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/wofimakunulifotenuza.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/49850713574.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/zemadasojarudokedegisukam.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xerurideli.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/nagibidozolakok.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1fbfe73e00a76f8c3c9422cc90326436/18104101281.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/niwedubexujubozuvederaz.pdfIn PDF document text
    • http://gardatrans.com/content/Files/sawaxaguxo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161356de0dbea0---81039151194.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_off0000c454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10588 bytes
SHA-256: ec96bf9ad16095fcdf7d149aaef4a1a6a497bd695c070cb17407bfa9b6948a7d
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 18100 bytes
SHA-256: 262673509291a5cdb238ec40a2bb08fda89afb561392e6e57eb9db7d71918ed3