Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a292bfeaccadef8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 15:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25eb737f47c4b5ddbea86adff3fe41c6 SHA-1: f0d52a65193ac77278ab23bc8bc41f88c6b31dfd SHA-256: 6a292bfeaccadef8ebab97d84cd181a67d50b8549265ca77ade26a248c8d6ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, directing users to numerous external URLs, many of which appear to be hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=last+shelter+survival+tips+and+tricks PDF link annotation
    • http://marketingnews.fr/images/file/zaxiliseroxalozibakeka.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210610105134139.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/givokebefiworutizad.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8323052ac47886085b53fe21b4c489f9/62893881758.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a459387ba0e21f0a85b590e83222aa3/kazerabowewajunejorugena.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcad8e14e35c108599b5ce8e14c2431a/dovefekamalexinowelewamek.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b93f5836950cdd3322ea520f50805ef9/nitaxojipalulejexuzi.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/wuvuj.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/defiwexitifenewawupolofog.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607368dcc961a---fazasosan.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/kubuxul.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/tulifef.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8233e1860---sesirijazuloforeda.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/xupajelij.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/48060069040.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/538f0bcb7393dddbfbea63f1ca2abeff/soviluzado.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/4615826976.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/54398525808.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/tebowavubamibisolosuw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d55ef1dbf2---meneturuz.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/3281681993.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kanotokexanukivofan.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/51304636471.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071b95c350bb---13342708907.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607031dfb7eef---93798739954.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 17048 bytes
SHA-256: 60b1fd8bbd28c6528b32b0c9a1ed8216430ba98ba7ed522b1c099580ce4a581b
font_02_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 10708 bytes
SHA-256: 322282e625caf972a20a6c09986fbba56d880c4e20c756a9aaf1e3f62891a55a

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