Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aecbea65b0cd2f…

MALICIOUS

PDF

178.2 KB Created: 2021-06-28 04:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42b12a49dcdbf1f872273fa749e2b6c3 SHA-1: 2d168accbd62fc4bbffbc87a7f7f2ae7f2383b4b SHA-256: 20aecbea65b0cd2f8709d6d6429ffe7bae7060bf2be517c569dd6d0d72389c99
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5fbf353e1d4d41754fc404ef98a77ae1/50452849146.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0f516ed3---zamesipumubafenogageput.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/67259854167.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/10af4f5fbbe16ce3f3f2b547e22e6632/88813818481.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/82d4c46314ca345e0bc6e985fa773cb5/rigidowedogutere.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505065459279618.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cc9a1077---rakowipori.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609602584b292---61499914166.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0812002cb2---14224067945.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1f56cb5c---delodapivabugitoduvekofaj.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/34688419820.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080822eaab58---40932080226.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/57209621549.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/56074044448.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/visiwixupiripoxogizev.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a441af3e45e---nejugokogudurarewa.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/44439253461.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/63ugqjpi24o6l6fubsp1favg8s/gegutazojumodarinora.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/ridapopokezogawog.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/49028899424.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8fb41b57533217da9f8fe1e0dad2da8a/rupozis.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/46605897495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ugc+net+history+notes+pdf+in+englishPDF 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_off000257b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x257B7 18748 bytes
SHA-256: f84535806284bb6202855ca99f8d41d4a1da7b50bd339d04b20a39d5ebe8a64c
font_01_sfnt_off000289ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x289CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002a1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1E1 10860 bytes
SHA-256: 40ad4ae07520d2a80555cfddef249ead8f98acf0b8884d8928b6b00bd16c270d

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