Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf0ddddc4ccb110…

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 10:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fdcd0d87846a732ce17aa3c283aed7da SHA-1: 085a8da981f30defd914cec90bddffc379c1c21d SHA-256: adf0ddddc4ccb110f411f8bf91330c689a95d3d6368fc4435db6eadbdc38d060
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting it's part of a larger distribution network for malicious documents. The ML classifier strongly indicated maliciousness, and the structure aligns with a spearphishing attachment used to redirect victims to further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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://dgjst.com/upfile/file/32691574700.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f854828785---lesatakujonitexalepela.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3a186743be52dbfbf527055c293c9b34/vapizemow.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59683f2eae---zexujurunukoziri.pdfIn PDF document text
    • http://teraval.cz/res/file/kafujafidimuwi.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/fazizuzusi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/jerowotopaveromid.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdca628cadf---galujagixulowemodamamufax.pdfIn PDF document text
    • https://ancoraeducacion.com/images/kavasajejikerugawufike.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba11a049350---68467408625.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/26465307079.pdfIn PDF document text
    • https://soechi.com/userfiles/file/29772779806.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mrrsdjr89sa2nsd3tvd2o5aegs/kaxiniga.pdfIn PDF document text
    • http://czapla-dachy.pl/public/images/fck/file/vukit.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9db062964a---81600117667.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/59404760433.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c74ff82445f---tokiwenedonawelowawojet.pdfIn PDF document text
    • https://medtek.vn/storage/file/83379756574.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/55877004967.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0a15be9d---balozalukine.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ixemelomopevewanovofam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=investment+fund+business+plan+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_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10696 bytes
SHA-256: 1609e039137fbf4519aea3445e2f5c523a145dac505fdd2cf95f3ffec2fc106b
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 17236 bytes
SHA-256: bdb152939af56500788d535deeb535ced0fc90f04edec82aec1373814b54bfb9