Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d05152ad8ab2526…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 01:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 916c3c73b47a8064efb01d92319dc886 SHA-1: d26db1057e4e95eb8d7086cd07b62232d8743165 SHA-256: 4d05152ad8ab2526e332369a82caba8368958bfadb1c354d78c9bd47758d378e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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
  • 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 https://drafthe.ru/uplcv?utm_term=transcendental+meditation+mantras+pdf PDF link annotation
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/djdh91uk15euqt78mj98cn0rjv/13844422164.pdfIn PDF document text
    • http://prompol.com/media/file/mekezisetagiz.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/48001672323.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfbc9b1c---nuravo.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/pofojurafoxediku.pdfIn PDF document text
    • http://mp-journal.com/media/file/72369744252.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/tetozoveg.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/numer.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/furetunomagiweguv.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/mubupepitibodo.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fivexuzisusudipeketepiri.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/42071470770.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mogalewiwomamipelu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/21114554977.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/kogedivikapu.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/buzip.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tavuvebedataget.pdfIn PDF document text
    • https://congchung7.com/upload/file/jekavumewutujanabi.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/lezozixunezexawesi.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/52579980444.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/rikozunowume.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/pozuzawadeja.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614085cd3df37---9133987566.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210916093756.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/9320085533.pdfIn PDF document text
    • 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_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 18496 bytes
SHA-256: 6930be7a9e4fce9b4d4d25799468c7716166ae678b043483d68bfb5e0ffc924d
font_02_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 10744 bytes
SHA-256: 3c97c5f4cad0c1c8a5b2221dd05e336580e0541239c712d6fddeb98cfa245398