Malicious PDF — malware analysis report

Static analysis result for SHA-256 131edcb0676d8c07…

MALICIOUS

PDF

73.6 KB Created: 2021-08-05 04:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 560d133669f9d5d81da88a6c7ce6cb19 SHA-1: 9b70685f11f241d35a8e1878e5097d0a17c86999 SHA-256: 131edcb0676d8c072c67fcb453c3bd93e54cd9436985aa744d6993b8d3f5f749
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', further supporting its malicious nature. The primary attack pattern involves luring users to these sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3916

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://chcial.ru/uplcv?utm_term=little+big+farm+apk+mod+hack PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/m1vc151hco6j5crc6e2skgh1ij/nidowazimonibefat.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/60601087285.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b18fd60125afbf0c63cff1324897e46a/68761198770.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210706_FDB77862872DA3DE.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/22891713249.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608b823061a07---rozemuxetiximibupevog.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eeb8312d---73188766463.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/xadus.pdfIn PDF document text
    • https://qnzar.com/files/42929143961.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/38436891519.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210602_8AF5D33D0F1CBFE1.pdfIn PDF document text
    • http://berbun.com/user_img/file/89968710897.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/wetumuposoxudulawujuf.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kuvuwawejekitivireluvo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e043cdc43d8---nupokigaz.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/tmusl1d4oc7q2msjofscr0k222/kulilutimekemififoboni.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/dilunagiko.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210615_8809823AE3C7B458.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3f59a850c1a7c67996a5dbff0341ed8d/lamugazudubatinop.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/nixixiwidepaxonibojevok.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/cbd75944290f7b49502dbacfa0dedfdf/36695570944.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b5e50b94---buwol.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/29156322040.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0dc824df---94050131566.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/lanizazoj.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_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10984 bytes
SHA-256: d200ccfe58ebead44a73abc2de109b23d320c27644b53ddff67b1b3adc7b8cf0