Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f8c9f4078b0ef4…

MALICIOUS

PDF

84.2 KB Created: 2021-08-16 11:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 994203de0909e68f050fe54d761c91a7 SHA-1: 1f3d8d9de2758504e7a70c282b9e3a0b071d61e2 SHA-256: e8f8c9f4078b0ef44166023c0ea3fd971026886098e85490a8e2b4f90defcac9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary purpose seems to be directing users to potentially malicious or phishing content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.zywawiara.pl/pliki/pebewolaxov.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1b74d135cfb4305e80d3fe9885066e44/zotapedubudekoturezujer.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc18e771b9---jezumegofuperip.pdfIn PDF document text
    • http://dd-eng.com/files/files/67345527600.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/fisunegekawosubaridasuz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e053e2b1ddcd2b1e54b6c8aba46a29/54699948556.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdb523f57---13277589122.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb040466eac---79709610631.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d589a1616---22644090875.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/4811638053.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/vodagivevepetodejomabe.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/521ead4cd7541a0ad87a0c404fe13b0b/22918135774.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/dozexasudisuvorexigilele.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/85706485494.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///42337316644.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/kemeteregemorabixuju.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/29214826693.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/63325022902.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/55179587293.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7bb9b3ea---buvukil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+setup+obs+with+elgatoPDF 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_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10644 bytes
SHA-256: 9e490cf1d1e01e5ead9cf2f51c8b76a3dc221577cb8edb5ec41f14d59ce09f90
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 17272 bytes
SHA-256: baac9b7978e7087db23976d6d597eae73618f14c673a7f5fa2e843022ee2d833

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