Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2a78df0666d0e7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 15:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32b8d62920a45cc7320782e7faa05d6a SHA-1: 8824b2e749a78d853e6af7a5717fccb2f4c0b578 SHA-256: ae2a78df0666d0e7f874c4dd3dfe91d2f2d86646217c71ef871d44a0870dd7b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mk6hjf1qe13mfondu1vgk4v4b6/mamaxusokiremopowida.pdf In PDF document text
    • http://soflocops.com/clients/67403/File/15222968096.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce0fc7f76---58894318404.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uc7v76s9516qnqr816h0vrriv6/bafaxitixan.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/konimijodelezewamulusij.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/60170180605.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/sepugozinupodepuji.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/85332595822.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf848278fdc---87768615558.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rinejerabafupowevo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160724393720a5---fosimu.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/79952503258.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/93372600401.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/07e1f3b9b49e4fe117c476b22c3c7674/lapewalezo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e856bbdc950---27697166600.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/61817178550.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/13359194197.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8ef04c26c183aad874cca83a35650c0c/vuwor.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/bomuwobore.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/2246209547.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/pusijopiposa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91e02ea69---pixolemosu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161059d1b0b14a---309522646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=worksheet+on+integers+grade+6PDF 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_off0000c1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B2 17120 bytes
SHA-256: 4986e713b3dcc5521115b7c028aaadf46f02719801a8c3e4c31f86e986dc2ae9
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 10736 bytes
SHA-256: a5851c46772aa302e6252009a73d8a0587faffdfebb074db0ce104dfb0bf8e3a
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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