Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5909fee8f6c0ee7…

MALICIOUS

PDF

98.9 KB Created: 2021-08-08 17:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81d8c35bec7d983619e4a67dabad3de2 SHA-1: 0b4cdebbf8b4fba310cb5965a4915f28b96032a1 SHA-256: f5909fee8f6c0ee7b3f3ef302f9cb1c62c378ed822012bb19304f7f804aec998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://drafthe.ru/uplcv?utm_term=sword+coast+adventurer%27s+guide+pdf+google+drive PDF link annotation
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6ebbd2b497e14d7779465f2e92bf88cf/78230940741.pdfIn PDF document text
    • http://etre-belle.su/images/file/desasov.pdfIn PDF document text
    • http://erpos.sk/data/files/71937526321.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/tosopubolutetetenivuwur.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0459060ffc6021c44e5954cc60722334/zofuxaf.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/9099042702.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/kugujenawupojipotawuzet.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/kubitaf.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2on1mo05k91bmfkhbnd9tprq4d/nijafatamiberumifunipoguf.pdfIn PDF document text
    • https://renault-service.com/userfiles/33460989903.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/jitopagosinibif.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4e8c6b04---zurusatanamijexidu.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gopagurananela.pdfIn PDF document text
    • http://kleiberit.ru/files/file/zimaretile.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/kabubeti.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bbqfqdshb5d7atb0qj9loahq4l/51818615460.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/kixoredujiditewavovar.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/joxifogogonuvow.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ece9c2d5b77eef308af80f9cbeb448b0/redonefesakefekojuz.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/50403309095.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-25/20210625030429371229.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/sasubufarof.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/67732053350.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_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F8 17572 bytes
SHA-256: bbfea06539036758d7cc8fb3210c127213731c498bd37fd1cd94157b4d1864f2
font_02_sfnt_off00016101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16101 11156 bytes
SHA-256: 68bd879e6b9033fe8d673a628744bad0bd31e1c2854b089ffb84171785fc4629

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