Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9d3ce0ca8cff30…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 19:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: adc1d01f78c779be65ef5da226550613 SHA-1: 95e2ac0ddff9aaf3f7f8f3b5ae83d2457023e4a6 SHA-256: 3f9d3ce0ca8cff30fb9ce9110e4ac08a47367a13ebc7d4d4cf25ce02f9bc6ece
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting. These links are likely intended to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2990

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://chogmai.org/ckfinder/userfiles/files/fitudenuduwulonanuxud.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f7e68fd3bf602b59c60ca7391a361b19/59334131584.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30a1b7f4d---41298112.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/81981065655.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b292dc9e1c0---25611220707.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/61b76647ab82edc759cec894715d0176/91215521738.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/xexomatodiroxodotosowog.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9855ba416fa3d4aef1b88bfcf1f3b295/waterixekubekekomugufepu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/769fec416aa95fcf6188dbe91bc83b42/zakebajoderujufe.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8840d2a7a6---63708764589.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b755c9d9ee---18394443476.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/vejatilepijiwopaw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e69e88a1---22695084771.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf4058915---jedebejozi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-13/20210813182151644753.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7050e2575a2ee869ce3781a3407bed39/23587478173.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/38978269638.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4e965f66bf07b3bdb181a89b29420e2b/47234603348.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/69632267944.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/57bfc04106f909f4c334db465fad9e5f/fijagibarobunejefa.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/25984008364.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/36870534057.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/98463488903.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a413f1a8cf6---28073255072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=categorias+monotributo+enero+2019+pdfPDF link annotation
    • 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_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 19396 bytes
SHA-256: 8082f91399014854bad4a54440a140dfbd100c523f81c9f28ecbb2926f42a81e
font_01_sfnt_off000132a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A7 11528 bytes
SHA-256: 203fd2a9cf98f457d1b312117f9a657b4cc9a773a47c7ebe008e032f6f890b61
font_02_sfnt_off00014da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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