Malicious PDF — malware analysis report

Static analysis result for SHA-256 257bb8a477accb30…

MALICIOUS

PDF

87.1 KB Created: 2021-08-21 04:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b412bb293cce2b84f2dbdebc731fb53 SHA-1: 366b36f22e575c00100e9da6816dabd765075474 SHA-256: 257bb8a477accb30a44f5d660969fba27d71d2889066380e5ffc9344466beaf0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ecoverservice.be/gallery/file/63950534712.pdf In PDF document text
    • https://pima-alarms.net/slicice/file/fuxisewarubudokabodekiko.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/af7rk1ivmhcu9ep2gbvs6m7if9/7282825868.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/kenomefogi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7528c50d---deloda.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/fawijipulanorugozejab.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/pupuve.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1516bb2d64ebfc1613049d7dbad97f60/xamakox.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607380af28ddf---lixeziwemisejavegewiv.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/12387616795.pdfIn PDF document text
    • https://netpage.info/userfiles/file/zuxevopizudavabubo.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/winejewagumopedofitej.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/217d0e140f19a71f9f4c1068b91d75e1/50157072689.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/87715819737.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9631175b7f5b1105d1588960a33012d3/32998482651.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966a14d37e5---81599063039.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4f08a8f6c65fea366d8da2deec41e412/zoxuxalu.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/nudisigunefusizenizamuko.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/2841320998.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mufosofokowovexufi.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/99795613658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=do+i+have+to+sign+a+non+disclosure+agreementPDF 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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16852 bytes
SHA-256: 6fd5348384389e59d794d8d571ae7bcf0908f5ede4347811c74b505baa68bee2
font_02_sfnt_off0001355d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 10984 bytes
SHA-256: 48ffa4309bf5567618f8fd77e4378c2aa5557a7f32e08dde3695a4ac10132238

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