Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d49f2e1ed7809d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 09:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 34f0403a45bc113f8258f9f5251eb123 SHA-1: d0555fc872e4482fc875537c391532b4ce2eb0e0 SHA-256: 85d49f2e1ed7809dcdd796b5aacdc21a25b6924b2c92d29d139425b59ef81899
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 0.9975

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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