Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c52a507ce7bec9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 07:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f169292ccc774df770e51b5d22549f0 SHA-1: fe6597f599f3f7dc7cd3239bb8a272bec67dc94e SHA-256: 83c52a507ce7bec9e63bedc217fea072a8032be224afe3943f662707bdc783e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution lure. The file's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/6e02638acef6af2f76370dd24e40ad13/didepoxagowatesekobosivex.pdf In PDF document text
    • http://oodow.cn/upload/file/210719135518695931xwb3gu20tk2r.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc3bc5489f---19177710754.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b0a9fa51dd5664e64e24b9d7aad029ad/jogirowudixezuline.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/jusazafomuxoxipigenowed.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41495955424.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160816e0da92be---nogozapeperuvuribaza.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/86935933209.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b490b749116---dawelegexapumokokoguv.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e75e5eec2---12052323223.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/petakotegumapudaxuguf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f346b38b279---xavafofoxerifogitepakegux.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xaxotametaliwapupizuxu.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/pelixunevu.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/11271872300.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/repedosaxutujabumuru.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wopeg.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3d25402e407ea4e108643a07a491edbf/libunovekunosovenatifab.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xozoza.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/zuwefivosodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wordpress+website+design+tutorial+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_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10992 bytes
SHA-256: 88d6c8b42d29617a92b6494c27300cbc37a79c358e380d8f868baea1ff3b93cd
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 18428 bytes
SHA-256: 70e7f041345ae7fef5995e8b719525d83b8dd232c88224229720a3a5c9844560
font_02_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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