Malicious PDF — malware analysis report

Static analysis result for SHA-256 56952d0dcb6a7a5d…

MALICIOUS

PDF

65.1 KB Created: 2021-08-31 21:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f499ca456c2a95c97b603b4ea811910 SHA-1: afc260a8f69aceead2fa6b44667f59ed6f49562e SHA-256: 56952d0dcb6a7a5dba5b2a453ba0bb6d86b8c1c640ca4afad74f36f226b35cc2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7mb2emp1qum31k50laenf6shnt/tupaxodojeludafofirux.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/025ea4dae040f738a66722e184cb7bc5/nutomewedozupizi.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bejiregijeb.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/48995494060.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/a204cc41b377b1a9763d1c5f423dc0d8/liwulapol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3383cd0d66---zaxowamodifumuzojewe.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/widamazuravasukon.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/401f43a8a7b0e1516c8640a74323a4ce/98009631502.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/jibenunuw.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/rivikuvibobivavuku.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/vesudu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/kiwev.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210708224923.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/73a2330337ad5de2b31e392a380435eb/xifetegapulezodawezudufuv.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/90048010945.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/98468440418.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078495b5d859---13965573749.pdfIn PDF document text
    • http://nakatka.com/files/file/44851537732.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/71255284394.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8buto0vgd1n354fdqifkcq1u56/79889065009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=once+upon+a+time+story+by+nadine+gordimerPDF 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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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