Malicious PDF — malware analysis report

Static analysis result for SHA-256 656b954235fc713d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-27 13:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91ceafa14e426c1633ffaab1deb3c6f1 SHA-1: 73c597b016fc9b047fca25d72403fbee083a1436 SHA-256: 656b954235fc713d5940d42cc631b91a8f055bd2b871ec434843080e8dbc9970
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or scam campaign. The PDF structure itself appears to be a link farm designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qckk2b175ap6jruom6v52r9jp6/94089607934.pdf In PDF document text
    • http://benhvienlaptop.biz/userfiles/file/64366760143.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/bc67f5ed38ec4a59e3ff684e9f2f8eea/xogegadosusirisila.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/dedae5c66862d15a50941bf5e6c3f774/37190792681.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/ripemusimotewurodugesa.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/72731322023.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/zotenugenitodovitinewota.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adf3b94b966---zalavemimafux.pdfIn PDF document text
    • http://myphamasia.net/upload/files/69008803156.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b8c65eef---17711356256.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffad01c62a---71498589553.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4903e7511---degiporudedogibexab.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/23810557777.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406ab0e0c7---lojasel.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18b354a3ba---8596012941.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/21723923112.pdfIn PDF document text
    • https://clove7.com/userfiles/file/guroruzafuzakonebeba.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3fc924e8---mukisalimawe.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210623_121529.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34b040fc2---57222911336.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/4226418699.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/34e268b0c533a16ac4de5a5151349d2a/41086797106.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608295080be6f---ketapegesuvesilufur.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/rupiduvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+insert+a+pdf+document+into+a+word+docPDF 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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 10912 bytes
SHA-256: 19f28ef371d4261659f802cdfce1232eda6de264658bf190091c8f8156e6c44b
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16568 bytes
SHA-256: 98d45ad34c6f3a17df7b96c897d780c79729cb1e784552b7945cb935a34b4e18
font_02_sfnt_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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