Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74ab727727077f7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 11:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7534f89c129aefee5037dbb6e1533d1 SHA-1: d83768c6adeeac81c10ca3ed6d2611f32db1b4e1 SHA-256: c74ab727727077f77c743404f16c8301ff5de28a9a69034612a9adcb9fd30101
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS upload directories or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=oster+flip+waffle+maker+manual PDF link annotation
    • http://bukvoznaika.ru/ckfinder/userfiles/files/sumigubojikalexutadi.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/pixiwis.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a913f2dc8f721ae086753d4e50491c9b/damorosipu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607126ecb32e9---47065397125.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/xaxozazajagorokapadefutox.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8da2c4a3---kubiseledirixazoxex.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/malaw.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/tenoto.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/39037225026.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/sorixotomud.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/23269704253.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wutizutidileterigenut.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c56b1a0ceb37e18b24d856f0a4a5d63d/23313426074.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/50261275609.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f8148dc03868f0acec97bec59cc1cbbf/pubemetugu.pdfIn PDF document text
    • https://hirurgija.me//files/didibiv.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811119e2810---poded.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/setimenexugofebimo.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/zivalelejo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e9adaed14---27748146505.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/womog.pdfIn PDF document text
    • 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_off0000cd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 10700 bytes
SHA-256: 476576a5549ce5896658376f6d17221fec64b533924b9b8e0353fa0f4a2f02f6
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 18456 bytes
SHA-256: 9a05ddba3f918e42a7c0e28940bd6cbc39eeed9c7581e7cb47b25611239b7c08
font_02_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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