Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9865ed0390398d3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 21:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca3bab287f01a619f4479d3ddbe5a03e SHA-1: 1c3ae2750cb5fe1cb88b9177979b61de388ab7a6 SHA-256: b9865ed0390398d3c0266d570430022e43f97106e99e4d50827f5b920de9d03e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of external URI heuristics and link farm indicators reinforces the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://infrive.ru/uplcv?utm_term=fuel+cell+research+paper+pdf PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c8f0d00b0b9a863410c9fd1347372c7f/kewexibovejot.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/91728047448.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/54030710349.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//fedijodaru.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/18541819651.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/xupupogosike.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/61236766309.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/joseselewufam.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/u70e443vn12ug7oko9647jnir1/57020578212.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15026717312.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/tetemi.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210622_DE1073120C9776E6.pdfIn PDF document text
    • http://rideco.hu/upload/file/mulepasinoburulejerovos.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed323aac2---15934585983.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/dvi48apislvopep0dmgdulhltu/doruwurem.pdfIn PDF document text
    • http://elitvorota.ru/f/file/43308409769.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/30326173021.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/75925103189.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8bedbf993abc55dd737138a7cd656f1d/pufim.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///71487180550.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/27912660083.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/rimarusamaw.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/91e1f57a44a62d569e3e991b91a3f182/fidajefa.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/norexamisirejole.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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 10380 bytes
SHA-256: ff376b2c67aba37c4715829f9c80864f7674db040cf777a081bb043cfa4bf1f2
font_01_sfnt_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16860 bytes
SHA-256: 11b400638e99225772e8ed53ce382daa31cdf919c064cee57e487a903e41f754
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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