Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b087fd06417ffc…

MALICIOUS

PDF

62.3 KB Created: 2021-09-03 08:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa5af4641a9033c0361652402db83027 SHA-1: f3c3abfada906bb81391d4768014a8071d98d7f2 SHA-256: 57b087fd06417ffca1449e262f2ecd5e32616e1ccaf1214af2d633cceb9525cb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, indicating a phishing attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9069

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c3162r0eat4ahc2mbbr5s8eghj/72602314837.pdf In PDF document text
    • https://atraba-holding.com/userfiles/file/bubanusidimopax.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090893580158---kafowokafepikokuvomura.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sosovusufakuzaleve.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f79881a3de9---65374080313.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/dageredibajakebum.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gitefibek.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd04c6f6ba---87395596297.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f544371ff---11137729191.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0af55312---febalozapizirogaxotuxo.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/052638afebcc55467cb4f4e41c8811de/31570067517.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2966b9cf05a106ef84455b9269292a7c/31685648090.pdfIn PDF document text
    • https://kawanmto.org/contents/files/zokopexasalezajafi.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/wumusutuj.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/72126112731.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/pamerupopakofakukemuv.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/28996676737.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/pieq9aa3rn63cfpm0gm9d7421b/92015386695.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6880d8f350ead70b56b14b0707a1590d/76240645389.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608433ad882dd---54600780467.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/8a46765cb9df78db27455b1c134af4e2/tufafetu.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/balekifidarudavab.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///48846509069.pdfIn PDF document text
    • http://air-ned.com/uploads/files/43416846820.pdfIn PDF document text
    • http://vce34.ru/attachments/file/vofamajivotavokumitel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=digital+color+management+pdfPDF 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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1