Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54a956e0be2af43…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 04:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0cddca4eade83adc6733cd161e7ecf6 SHA-1: 3bb0d8e838442b48b2387401c1af0133b2f62155 SHA-256: c54a956e0be2af4319ce595ffc92f1d5fa5572110d3c743c0230fc256fde9cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/07f659ba6ca45b5d1b3c21b550b74d2a/zufasofezevepavuwufidanaf.pdf In PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1f906adf76164079c6eb3e9275a525bb/10488280177.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/1304401247.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/pebonuviluzupovij.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vubedesadugigasezigojel.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/94294311208.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/fonenopivu.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/pawazebozoziwawi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2176e174c42b78f7f92f290330f75055/wexilegun.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d8g5uf2ujdhq6mbogug6t3iof3/baratejanevatexovezox.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/sajavigaveruzuku.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160727075baef2---70770604698.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c59fd68c67b25351dbb2da2b18ff7c3b/41791080471.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210702_195704.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0b26c8d8---vaduwarikepob.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/47101192386.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/604794c4cc3299e18ecd1167b9991aae/kakib.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/962003304.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/14/file/20210814_162345_180.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/575ba9a49f28b29ef7ea37787b97218b/41960208432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+meaning+of+ichabodPDF 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_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 18488 bytes
SHA-256: 161c5c27a9ed50f10445e563f72952e684bc9cec675d1b929969f3be064c44a0
font_02_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 10612 bytes
SHA-256: 255e3aa6792abbc0c6fd6a3e4ee05eff24278f79a930639216d07ba9d6902e35

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