Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c04c5c38bfe3f64…

MALICIOUS

PDF

63.7 KB Created: 2021-09-13 07:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06eae60783fc9cd7bedac5ce20a5b570 SHA-1: 85d0d7e28348ae5ef0ec1fcad0d9493c2729dc2d SHA-256: 5c04c5c38bfe3f64e2fdac0bff2f799e32a45ad06022a95fe39cc1ba4d2cef74
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document contains a link farm pointing to potentially compromised or disposable hosting, likely intended to redirect users to malicious sites. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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.
  • 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
  • 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://thietbixanh.net/uploads/files/xakotafifugovi.pdf In PDF document text
    • https://highlander-inn.com/assets/userfiles/files/deboxotomu.pdfIn PDF document text
    • http://thongthien.vn/upload/files/62345817684.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6391ca68---64087418234.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kfi4903eb3r48oprqkdf2ls1v6/37034267462.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/nukumopigesu.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/fusamupejuguf.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/36008041687.pdfIn PDF document text
    • https://ewt.cz/res/file/tudokokipisejepusuvakixi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/vuvekojuxires.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc156cf51---23763000373.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/lemekurunutiziwasa.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/selegafo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/94212958183.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e895a79089---74525819014.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/pomurexe.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/15620351916.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/dosuzuzegusububusixod.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/80021159562.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/vutijorabe.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/52533076378.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/majiwuvipedipeminip.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/mewaxipifewibaninuvel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=smart+phone+galleryPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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