Malicious PDF — malware analysis report

Static analysis result for SHA-256 3081f6ca2678c5ae…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 17:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 158c01ba3345c77d99213b8f92cb2c3f SHA-1: 76b5f479d389ef96a9158d50d6aaa037baf9d34e SHA-256: 3081f6ca2678c5aea1a2d60e9b85bc9a1fba5a1304a7a6da946cdeb30b657c0a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/05d5b564e6bc3289871e38825675197d/jogamoradaro.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9cb088df9492ac11b503c44c0719c74a/39030836088.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210610191549642.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/44035254301.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/49n1e9g4fq5m93impu27bg1ju0/xogukawumu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d4721a6c---loruvesizebu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/be2a676277f2691885f8bc7323bf5cc6/dupudirunorefizerupaw.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/79372400084.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/13627698605.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/tasegozexolosanuke.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/33386529354.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb2a9f92c---81866646060.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/79979666707.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a7644f06a6d49df6c086fb3176617716/69086787891.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcbe785c6e---lemajolixidi.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/tedaz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9573b511---gagukudowezepitazilofilo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/35524626173.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/1118917063.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/857b0010fd6fcf83fa4db657cb2839f1/87892267832.pdfIn PDF document text
    • https://airshow-bg.com/file/16985008783.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/fapobekojimelizoxutonebaj.pdfIn PDF document text
    • http://nktrading.qa/file/files/kexorexogovasumawo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xilapitovejomu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5caceefe174549805092a617d183df4f/76992237345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hanuman+vadvanal+stotra+pdf+in+marathiPDF 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_off0000b768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 10788 bytes
SHA-256: a439310627a896fab2c7d29d5f6900e310a1b97e2362f29d51bba53c71d0c1a1
font_01_sfnt_off0000cff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 15828 bytes
SHA-256: 7c72ceb5754c86d408499067433977c5a977beea50364f53a0764144af4a91d4

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