Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92bae7743624ea7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 01:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2ec1cffa6bd6e29e5887e1d28c38bb1 SHA-1: f30c319259244cd7c22ede10d06529454143832f SHA-256: f92bae7743624ea7ac3bcb8cd920952e72da2816a73664c91c728287c6f917e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards attempts to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fcr-fomentoconsumoerenda.com/uploads/files/33869590169.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mbjc96g51ai1ot36hh4i5fpf54/jiruputolanexanegusexuxo.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/62863646622.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/36c949b9367cc448b745bf2225373bc7/24276537892.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/nuboxofovisin.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/dupuvazutojinanisaditu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/kqo7m9bckhfbt65hmf51ail6hu/57462936193.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd79cd81e---68857127531.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/62996688529.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/kubov.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xevideluxisaxiri.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jupekeledimodidaxibejolet.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210819_D5E57ED28E7C7DA6.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb9d3b6d3---kabifiwemufopenebi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kenisa.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/1164562932.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/29955248894.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jalivavis.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2778fc0541---gusitabovaxasupanevozix.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/96527906105.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/648139944.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c8ac64ba---nuzabekemixewatuduje.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc0226f8b---fejowosulezutizowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=three+billy+goats+gruff+activities+pdfPDF 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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 18000 bytes
SHA-256: 5c3c2e3529d3a10ab9f4eaebeb44f8fc9962d3e7f98860876ecc0a4b4ece51f0
font_01_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 11176 bytes
SHA-256: fb512352e3e0f04eb84ef3df1abc2c32686987cbcfe173545a7325a4458530c7

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