Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1b604cf673e9a3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 22:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25ad159677483887ef4bc652fddcf3f3 SHA-1: c85c318c4999922bbeb802544ea8df88bb299385 SHA-256: fc1b604cf673e9a3813f51d6b744875c5336b42e2198b983d4e8e7d79d311460
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a password-protected archive, a method used to evade static analysis and gateway scanning. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=percy+jackson+book+1+free+pdf PDF link annotation
    • http://brmhn.com/userfiles/file/20210911221054_alkis7.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f5859b9632cbf3be451b00a2856b2559/lexawopabaxogipuji.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vozun.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/57693566479.pdfIn PDF document text
    • https://taperagi.com/contents/files/bexodon.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/lunenadiwapigetake.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/9134730752.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161353f235f178---57113414928.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f072c58aad---sajisikujabowatudox.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/8302957735.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/52473672732.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/21945421806.pdfIn PDF document text
    • http://att-na.com/upload/wuzupawif.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/demoporaletedojizoke.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fodubenigog.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/xovono.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/gideretokogejenej.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbed2295ff---28876152870.pdfIn PDF document text
    • https://shidoremicrosys.com/media/divek.pdfIn PDF document text
    • https://medius.sk/userfiles/file/gitewimiko.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/45182305588.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/35184600063.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/joruvojefovigivusemipo.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/25617990442.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c9d5bf63b969e594dcb5afa234b21228/pijosamowanidimoruw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301aea08d6e---12554566901.pdfIn PDF document text
    • 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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10908 bytes
SHA-256: 23d32c4cf59370263c100ef9b36d5bd696028994262bf697661a98cc701d40da
font_01_sfnt_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 17560 bytes
SHA-256: 481984dc275b2f6808b3bbe0a55ff19394d285e72e32db69154fb3c3d6531021

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