Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb56737254300f44…

MALICIOUS

PDF

87.3 KB Created: 2021-09-13 19:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4065285345fc74a015efb5a796e0e2b SHA-1: f45617f8e0910c5141d015fe7f6b66e74203d77c SHA-256: cb56737254300f44eebf8a7080f6b66c60bbe194db2bc1bad947da81de38baaa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as a PDF containing a link farm, with multiple URLs pointing to compromised or disposable domains. The ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The presence of numerous links, including those on compromised CMS upload storage, indicates a broad attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1405

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tt-ural.su/admin/ckfinder/userfiles/files/pixafarunopifamubuzile.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c0534cca---voxawuwiw.pdfIn PDF document text
    • https://ahha.az/userfiles/file/wudalilowedejujobagis.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/desitedadixomadug.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135b43797f12---98507060395.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613422aed03fb---fosumakuvuxe.pdfIn PDF document text
    • http://only-svet.ru/upload/files/mudiragegudejabulumino.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xigotodonugowideb.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109030319068979.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/36962493459.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/66142443768.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210912_865218E3306C200C.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/89016499381.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/45630066155.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalemorakapipajonit.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/lupikibokel.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39562582744.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/degawi.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/sekekojomi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/267230fd56925d59b225c9e129f6d7fd/40923455523.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vigaradepofapiromudez.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zitonaje.pdfIn PDF document text
    • http://ccshecea.org/upload/files/jemixuxonikunovisalonefo.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/difuwukokaruzilivopevam.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/mafumisudiwawo.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210903035433.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/jojefojuguvimupimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+instagram+followers+bot+for+androidPDF 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_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 10900 bytes
SHA-256: e2a57a59359f52728d5b940046ab9226da1095d42928ab05ecf009631736054c
font_01_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1