Malicious PDF — malware analysis report

Static analysis result for SHA-256 398c64842dbcffed…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 07:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33efb9d058b35465977f55ef871ff962 SHA-1: 8b3399b6a87d11429505b57d8ad6d0ed49bc8ac8 SHA-256: 398c64842dbcffeddd1fa897cb3b4275c99de2ae1fd7c3e0a59b3851c8bd7aa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=reason+for+shaking PDF link annotation
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9h6rl4ttet55hgtvdtdmp7snm1/biwuguwomuge.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8595a7f1---19634627506.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/zipokilugifoveju.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f97c73e02---92450396731.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97741773540.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607475eabf771---kerikafaxetowemox.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6ac904176487723bd205128af1b0afc/23339334246.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210829171901.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/61751568702.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/bnn3jlnaq4hanidijqspk06ej1/zexudixonutimuvademapev.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea2c8086e---zojegudodovotamiz.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5ca2c422a6d3a6d1791467e9fd084a51/niwofabusumazaso.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf1ea9c81---53685366649.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/54472733278bf41149ed168736e260bf/topusunokejevor.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/75927092854.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/ff0dcf854df4d8ff44c18904487aa602/makofudeluk.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/23609082616.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/41014575733.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/59260308877.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nurawuzabegoxijefoni.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/tuzajugibowufizuvol.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/86545583250.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/1678000166.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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 10488 bytes
SHA-256: 1c2a31f8ac3960ece6d80a8e1b23f91e7fdef69f9374b7cd9a50fc75b806ffb1
font_01_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 17944 bytes
SHA-256: f0b977d09d5dcd02c8c2cb699ffe8198ff66308806b8d24d17105d31eb7633ff
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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