Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa88dc292318dae…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 03:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 488afd341e6bde11d405f3768e8e5b3b SHA-1: 3a61161d726c331985c18a3752f9ae0f72029b93 SHA-256: 7aa88dc292318daea5cdb75c8b7b9056452d06776ece25a3f7dfae66c62b1734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://jjinline.org/file_upload/file/37765787251.pdf In PDF document text
    • https://mzlpro.com/web/img/podborky/files/15553451183.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/91189731574.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf5e2aa66---wuxazugaguwesajabo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb12519ad---75778791597.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/laxusetovumimulu.pdfIn PDF document text
    • http://anpo.vn/upload/files/96714840200.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/puputadi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0d83c8d99c228e5d1b2ecd75a3d2614d/14258442225.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19e3f83a4b---47792580735.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16217150209605.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077337f208d4---33846612940.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bimafasejibovivifap.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/83thau90vu5a09timia1l9abb6/vowuzuwasapizisufu.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/216af9e0a6a3dc18010c284ee376cc80/69422048926.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/06be8fd86973f5c5a3f143e33d7c4bbb/tosomefe.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/1528046897.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/63964912728.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef95abae06---fexepagunilikivugemasa.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/67911343119.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4f0b6e7556e5f1ad8c5ae990bd4f1d10/27126265942.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cd163981---wefowigetiwoju.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3bf05e35a---62581112702.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202108251228248372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=alcohol+abuse+among+youth+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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 18412 bytes
SHA-256: 6a1c928544740fb93742825a08b38df2ba6d515cde756fa731f76cc4d9816e8e
font_02_sfnt_off000128f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F4 11212 bytes
SHA-256: f3bb6eb64fabcbe52ccb089c23fc112b7f6e17e92b16e55759fd278500f977cf