Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe6370a082eb78a…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 22:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c8af2958b58bb396ad037104559ce6b SHA-1: cc36c2b8e08cfaae27b22b91572d6ec3bb6362cb SHA-256: 3fe6370a082eb78a13133b6a15e3329e13dc246aff5b1e445c08e3f037d6b3ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous embedded URLs and the 'SE_ENABLE_LURE' heuristic indicate the document's purpose is to trick the user into navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d0ac059e---fujaxupuba.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae94776204---burawobitipusifukaditoxa.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wipum.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d763abb44---bigosifa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a9fd61cca7b5370e795fbf89f5ad01cf/17155725394.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/18152400220.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/25403444d64f2a98c18de4820a28efa2/dusalikipazin.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e86b186cf---12143889746.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210616200150.pdfIn PDF document text
    • https://shibbirs.com/media/files/99257061552.pdfIn PDF document text
    • http://aweibel.com/Photo/file/76558250469.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fn25cmundstdunrrpr6blglp8t/86072201913.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/80548357008.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/38486469614.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79645d8562---nowedatawavikugis.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0l1qq47v90kmprv4jrqb2r1mg7/17534830585.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d210647ff90---zakukarapeliviz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/72131030622.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b464e8c71---47863505260.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8d64f680---80743815729.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/a8a50c8c528ea3707754ac50896dbe7e/84116428564.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/movixisesusotimidem.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/adopapuxerumuwunodepowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=search+report+format+in+excelPDF 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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 16456 bytes
SHA-256: 474a0f070eee4198b10c788e0ec8ef382b738965ed7eaf8fbbcfcfc8dcbe28a7
font_02_sfnt_off00013331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13331 10752 bytes
SHA-256: 1a66412f35fc4ecee1302854ca45de1bcfb08e89375f338ff808f2a421af4636

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