Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc49990d2cde686b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89edf8e0790b801c9309e13d7e0d3170 SHA-1: 00ef1181c9b5829dff01b6960afde83493fa0ad3 SHA-256: bc49990d2cde686bca246d5e2c8ab3094738442039f7fd445f40ea6018137d16
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed numerous heuristics indicating a link farm structure, with many URLs pointing to compromised CMS upload storage or disposable hosting. The presence of external URIs suggests the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL patterns strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4146

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://oniceh.ru/uplcv?utm_term=tribe+clash+mod+apk PDF link annotation
    • http://abwrichmond.com/uploads/files/mofozivovogidopebidi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f929950c---nivivunegaxu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/46162977792.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/15653012801.pdfIn PDF document text
    • https://equimat-cheval.fr/file/66289434170.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/62246383537.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/92878615566.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/kedijuravurizesitiluzoz.pdfIn PDF document text
    • https://jobtiara.com/files/files/45480601707.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/42361923030.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jonafafadetemujorup.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56448980f---154871232.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/91679282358.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/namif.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/gemilebewupopoxidezonosa.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/bewovasolitumi.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tubalogozivixenarow.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/midepodogunaxigexepekogu.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/68661391492.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/55668791095.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/26593748737.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/277ef3a62611251a1c2e3d013e3cf911/vujejuta.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/55884680728.pdfIn 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_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 23120 bytes
SHA-256: 9c11adc31ce05424167c81f2226342f52058d7a647c1924228de87e4bc964261
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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