Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c58d4db2486ef5…

MALICIOUS

PDF

83.8 KB Created: 2021-08-15 21:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e190c59b257a9fc98bf133beb6304fa4 SHA-1: 583e2224cad60d14e6e7c3842ca1fd791b02b387 SHA-256: 25c58d4db2486ef5edce7c69681d1ec8a44c5a1430648d3e66e65179cc988b29
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 critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/87422c18afd58b9bf853aeccedda3e18/31030934822.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d33468eec---negajutusopil.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a1da7a9---10980431144.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160987dcbeecb2---xubutikoxeziboxudot.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/xapamurovebebexidinefe.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd608a65f3b---lurefuv.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/833c2d537dad8fa7c7b4ad8f053862c3/77693356469.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c7adb608---wulujavituwupixolifemen.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/vupip.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/97819512184.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e238f96d7d---ganobesorog.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/29195753201.pdfIn PDF document text
    • http://yuhongzg.com/d/files/17486760143.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d8d746656ab14859b543c6f21dd31053/pulibofexafokugotam.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/wepatoxapi.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/44265554097.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/ladifumoko.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210810_7EBBB7AE6B4F2235.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/53991685222.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ab08653b---18693928357.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/tixakoxuwudu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zujakofuvarovan.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/ramelubopomerobeb.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6mupnhpshnj3oisohmfcpvsji7/wupifevagumolanipor.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/zolarofirubefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=lista+de+verbos+en+ingles+y+sus+tiempos+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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 11216 bytes
SHA-256: e67edab7de48cb1fba34847acbf36eb38d73359150b5da3a7bc19760f19653bc
font_01_sfnt_off0000f6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C4 19356 bytes
SHA-256: f895831071c7a5dbfcb13ddc8c67aadbc613ff92259d9b9b1d89424873f7b077
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1