Malicious PDF — malware analysis report

Static analysis result for SHA-256 be73e8e285f5dc67…

MALICIOUS

PDF

142.2 KB Created: 2021-06-08 18:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6956f15a642f44485424525095219b17 SHA-1: eab60c54156b859c3021b36478d158cdbf98e64d SHA-256: be73e8e285f5dc67a7c5083095d028871992f5f786e7f203126fabeb41ad0dcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9108

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://crysiq.ru/uplcv?utm_term=deviation+report+template PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e24e381982b251c1dc18c1fc15c80ca7/40544420343.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa725e6f69f---xofoxi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/25j7o2dns0nld5qlcbqpq6bhhv/41444621635.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9kjs12q18o717j432bt46bn4jk/vorosidinutebujudar.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e4f7ldda1n3d9ktn1rthd3fjt2/90059695512.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760d718eaae---basupizuralasidinazeb.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3485743b---80358966385.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/917c940a12fb23f846e4eb72423d058e/95763324624.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/44832602849.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b5d8231271965253a48e65f6b69e1d7/xudovabirogu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r6sbebc8uu4b87gufsm8q9njvs/23138301014.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8i32sk457ct0hpg309sfc57fl5/95605549272.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1b3b8db21c8b90323b2492da134d959a/91809003338.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/4822989876.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/0npmhrs971ac1kk02pjrqtc809/26280918379.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89900c60e---jazapidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA4A 4848 bytes
SHA-256: 5cb0227fbcfa37fa527efc8b9468217697ec7d9f3c6da3678b193d917e65d57f
font_01_sfnt_off00020abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20ABE 13180 bytes
SHA-256: c305e620dab3c81f1cb2467962471d1499031ce946f59d5bb96c01455da22a3c

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