Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4c0ddf26c5ac30…

MALICIOUS

PDF

82.4 KB Created: 2021-08-16 09:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 082ebb46f80f29ed6d540f0875cbf394 SHA-1: 3ac2a4753d30d5b29b677639cee04cefc4ea71fe SHA-256: 9c4c0ddf26c5ac30a0fde0864b153e93506d76d2f666ae6eeaaa1efdd0c6c444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kartinatv.org/uploads/files/nubamidirarij.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65cb276c37---427021459.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952963eee4e---9897008270.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/65905533757.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b2d2b0b68---rusogawaxew.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd975a14696---99610575776.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/garibixokurozibumojela.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c68f3906b8762d720d3fb01ad4ada980/61121387220.pdfIn PDF document text
    • http://shesob.com/file/files/jorasafi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bbdebf0310a25344ad3dac6e2ba03f11/juluvepaxeje.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d8f255127eb8bec49de2ae1ed6ea1011/42903036669.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/sekolili.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/77967258151.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40a66d612---wiwajebijazi.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/gimotami.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/71560428061.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/91ukb23fmcsv4jslb3nkpu2lvn/jaxeratimitasenufetezab.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/25912109566.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/74261715593.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/84273591289.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/nakup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=city+of+thieves+summary+chapter+1PDF 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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 16460 bytes
SHA-256: cf0348adda702a0ab27b3ba8d4b718007fb1d5af08e7c57f5f6bd132c303d606
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 10956 bytes
SHA-256: 3d11a7ca3b5206d5ca56ca4668800d3c084cc75446e1e3cac27f8847a7f463b8
font_02_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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