Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56ac3bd4751942…

MALICIOUS

PDF

78.3 KB Created: 2021-08-11 22:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83f0f770e32a57a87553c3c5b713d2fa SHA-1: 578880406a5bba18e13291b29ca018d5cda76186 SHA-256: bb56ac3bd4751942df37cd0f277df7417179a48cc8c5d04f2cf0d851a91733fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of a link farm on disposable hosting and compromised CMS uploads indicates a tactic to obscure the true destination and evade detection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7117

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 https://catamma.ru/uplcv?utm_term=how+to+fill+out+nhs+appraisal+form PDF link annotation
    • https://aymsoft.us/aym_image/files/8276666652.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c099bb29248---49279008214.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/surawodibinogavav.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/94594124797.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30381ca79---25303642379.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077152fe1e51---lileferituvujonawex.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/regusumumanosaro.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/ririnozezolorigora.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/supoteporonaduj.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/e16aekht25qt7dg5370imb4fe6/18162012070.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8cb3d74c---xamewefiremimaziremol.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a94fc4d69---lokavijubilig.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d83b16af74273a657e5de997c88511bf/53488203740.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57843d26f4---tafumigofib.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/8861031627.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/dakuxobafitidiputew.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8feb30db76c0fb594b034c9330b3f056/56784822059.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/50142299348.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54897276340.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/009ca47d613acd2a788b899c70ee4095/nutokomoxurigeroxax.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/gifuniludusas.pdfIn PDF document text
    • 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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 10668 bytes
SHA-256: 72039095c4a91ca4ab1838b69b6bc715d402dad99f2b662684af4efb67d0f87b

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