Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75be23c3d6ce631…

MALICIOUS

PDF

180.4 KB Created: 2021-07-20 14:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d7486d7c20c7a1137061cb9e74a0265 SHA-1: 243f2b13e76a69df3e307765ee6edfbee8a2445b SHA-256: b75be23c3d6ce631e6b3418008a3a7a012f456a573297492b2d656c19390a3da
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7467

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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2292e0711a---sogosukigud.pdf In PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/kozigupuwiletakoluzazak.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/7tm3kbq45e7molcssha3s8qdlt/7644744836.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d034035fd---66314806154.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/wedesodixagudexisipesamil.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/sikarur.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7eqopjqpgkn5aekpjaq6dehji6/97727794579.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nato07dvor1b42mur8qs9tsd03/regatazikonijubovebuban.pdfIn PDF document text
    • http://sowitech.vn/upload/files/16123574144.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b63b426b---bigosatopasesipedife.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xozibogokatimor.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/gujutejukikotej.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3ac9dea45ba28a5cf1bdc323d1953a01/59945038705.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/an5bs5qvbpejhjimk37b8nbcub/ludopuzogarujerimuv.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d80d63f8---12271940387.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/43694778092.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cd465227c7b0ecf9a1c98f5c91a4ba46/gunuzapagakasik.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bb520a25610e2ef8184ef48960af95c8/kiwupovepiteda.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57756b3e---59673716027.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/86390848981.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4218965f82---47263733489.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210630220614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+low+down+dirty+shame+1994PDF link annotation
    • 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_off00028b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002a38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A38A 22988 bytes
SHA-256: 875a81a5f42ea02ed63a8c250bfade19002ef5d8036e9d6dc5bb0c26d8ba78ea