Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc84b2bc509861d2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 03:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75fb743c10b56bd0c3ddf04dcfe61cf2 SHA-1: cb00737cca7b0b5e09995c88abc175dbb3b5e265 SHA-256: cc84b2bc509861d204b2438c7e2635641d689f3b6230d3c9d0672c4aafc99953
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

Heuristics 5

  • 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
  • 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://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/16712463775.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7eef6ec63fc6017ecf775e8bd9a33ec8/rabovuxoxalomu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160721d3ce12e6---rujepisigozavovotap.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b59048b60b4---80079205350.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160915988bdc49---sevanilotekala.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/zepolul.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161109c2e87199---64870473392.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/filolusek.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/75eerqt9ri7qucn1q3qu8ppqa0/riwemedujewodanegupegas.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/junumidifetafidusulujiv.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb11c4edab---76517943766.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/tufosonimokebabimur.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/4400771917.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/31499557198.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/wejegese.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae862a973---64304823618.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fsfbmi72i7jaobc2qk44t71rlp/6797579685.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/dugijisunenajudugur.pdfIn PDF document text
    • http://unseretochter.com/images/file/mobelavipitanejitanuwukux.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/zizuduruwelajetogilebubo.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/podepivagugegivijivibi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/s8c6bad7jbbijbkqifr844pmk8/102859218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nursing+care+plan+for+anorexia+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 17236 bytes
SHA-256: 5e25bb5e81ed0c24566c002eeb3ec2b3f54b51b4d51056ad3af7dd4b74174ca9