Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b41af881505e3c2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 13:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f775e866843ee3ff7e8f2eb4fade8f0 SHA-1: 3c3458f54a3af8e0f35c91e741f018a049a30a8e SHA-256: 1b41af881505e3c23c41ce6a5e9df105a580fe13b28160b98418d922e22c29f3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b35p7m0i5p7g3ivkk25dq1e0e7/genuni.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e70a41935487bfb65fd88d93cb9e5bb7/pikawuwovaneledumezefot.pdfIn PDF document text
    • http://agro-partner.com/Image/files/gikodawawujusiduxako.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ef4c3f05---44972809263.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/janofidosa.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/48802334610.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325aef34b5---57744535612.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xutoloja.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/651f52d15bb6fae7644d628ae48c2a02/bezovopasivivevi.pdfIn PDF document text
    • https://csodamalom.hu/files/files/lebomopon.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/84560576975.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ae74c02cee9e2bd740f8c95e4a0e1b6c/gokutotupebafit.pdfIn PDF document text
    • http://stylekd.ru/files/jexosexikulufej.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/dakowurozapen.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/pamuxobase.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/jukukakomil.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161272ecc392c3---80548302545.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/nugejokijilujovode.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/afda445e8b9756243eb6f56be44f5a00/34654985359.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d3d27273da6f036cc2cc939c2ca6c3a1/85776716243.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a42ee975ca6403e6181f74d2e46f743e/toterav.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/23294499656.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608091dc8602d---pexorukilajapitufux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=necrons+7th+edition+codex+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210722/16268892764746.pdfIn PDF document text
    • 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_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10636 bytes
SHA-256: 9941901e97f576c4814cb0a54efe161b8a4de7896bc4a515c70e828e26eef38a
font_01_sfnt_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1