Malicious PDF — malware analysis report

Static analysis result for SHA-256 119c529557727535…

MALICIOUS

PDF

73.8 KB Created: 2021-08-11 11:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63bc0330cc787f6d424d4f4a3ba47ba4 SHA-1: 622100111887cc1369c822627b3669dd8ed63696 SHA-256: 119c529557727535a291c246579e67b13fd3f0e96faa6dff722c9f74a52326f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. These links form a link farm, a common technique for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://iphonerepairservice.nl/app/webroot/files/userfiles/files/40475641982.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b96ff6d9ebb---40906966199.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/27882521808.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607816348cce7---lufilesimup.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210609_1997F282FF7664E3.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da1b26a3e5e---53678237577.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9a409764---bebametaxokilowevoma.pdfIn PDF document text
    • https://sanidom.pl/img/file/18247711426.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/meradolilajareko.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1624394580454.pdfIn PDF document text
    • http://cobmedia.hu/include/61340580793.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a0094f9cac4867081165378b55ff3fcd/taganofi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5e745f3f9b162c9b6fea61f9c1a4a0bf/67509554811.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/86517264565.pdfIn PDF document text
    • https://fallsplat.se/file/43411697784.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/5765933485.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf821c02ee---88752748440.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/votigaremugodeg.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bemifidapareviveli.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lineraguranepop.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1734ca17---bovixugo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/96efc6ca9edead127eb3468eb3dfcb75/18432024485.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bj2ivbav0n2t9d1ol8j8gaqmd5/81371504891.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b4fac1717a5bc6829bfa534e6ad629c7/nuboledezovixida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pyar+kiya+to+nibhana+dj+mp3+song+downloadPDF 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_off0000bb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 16852 bytes
SHA-256: f7601917f946e5edb9553ba1657d152b3677b7a380feba51a393f21b6d025752
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 11444 bytes
SHA-256: 43c734c1a73656e72ce54e353598d9576a7f3b1aa242d4061978f27729a3110d