Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b8a77faf98ebdd…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 09:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a571d6c111fa074fd0d52f3989d20219 SHA-1: a8f5000f9cb5be9c67dee48baeb8156abf293b0e SHA-256: 26b8a77faf98ebddfcdeca9097bb5f76d3697dae5191ad1e33f4583ca124e822
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7179

Heuristics 7

  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wpscrm.in/uploaded_files/userfiles/files/komavikizilube.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7341107bce5a6c039410f1c0ef32d862/72270734499.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fadusiveninezinepib.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34562482eb---bajomigubasupomamuzavep.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/40614452472.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/67139407938.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161102d864c461---sasilajemeboxoxi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d3902b13c---54766838992.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/bcgdq08v7pta258qahkjs42iq2/95502281622.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/78088629251.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607265051629c---58208864867.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1df2820dc196fad552579fb8096a6940/fekatewaribapasegogozakep.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/nubaforikomuronazax.pdfIn PDF document text
    • https://nadamasristorante.it/file/22650733280.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/jakovebogowoza.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9144c0773d---3347419124.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210531060245_1674547177.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ln728trhiqreb1ij3vdfcsckq5/lowivurisewodedafesodo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/337d0b6a8d632a71de0d066f756aeac1/8736024167.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a284ec21909---xovidijujil.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/8126098566.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/36194713566.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/81f0a3d100ef6dc7b0ac99643ce1dc00/31588763404.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/21514039919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=human+reproduction+class+12+mcq+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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 17492 bytes
SHA-256: a17162f8f4af822698b092fd4cc5d33cd0d7d258da8f6382cf65c1504b4f1a2c
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 11188 bytes
SHA-256: d951ad80979d17374ee47cb6747912fae7990fd688bc0320cc31171a4bd97b9e
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1