Malicious PDF — malware analysis report

Static analysis result for SHA-256 55153ba7cec0c536…

MALICIOUS

PDF

56.9 KB Created: 2021-05-28 14:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 111a77ed5d57f0472a40278709bee500 SHA-1: 0cd4c7bd3103aafe0053766efb3867bd40f442ee SHA-256: 55153ba7cec0c536aa470b6d56f872a941e7bf2f0c548eb3aec57e890c5474e8
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage existing infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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 http://matsonconstruction.net/userfiles/file/muvomabugovolepifabete.pdf
    • http://fallsplat.se/file/6900404486.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078021b2380d---xudabatoxuvidus.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13e008da1---rukorakekeniw.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dae9130b6---54761745839.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092f08395c8a---68395712234.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/62148345608.pdf
    • http://paoladebenedetti.eu/userfiles/files/20071133603.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/da9d796a8d5910656c48ed3382212443/73416556973.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/857663460470f5d4a33707af00a1a0b7/bapikapuxejejefug.pdf
    • http://gleneaglehoa.org/images/file/bazewizapizuniz.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b94891466---7368221267.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/316928cfd4a4f5b0f0a616d3c1b1160c/67613764118.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3uimsospf780h57qfr2ofgvng/basuvulopoza.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074969f57eb9---80898748509.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714aefe23dc---27903602295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nyssma+manual+edition+31+pdf+free
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48f.bin
86a824fa456fd048628cea42f0160264742e3b6b068d34cc603c6bdbf8e752d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 5472 bytes

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