Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d28551cb34b27b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 23:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70b4911885e2070b431d3b9e8a0fe5df SHA-1: 56689bccfd780849807cc0f9e3b884163410eca3 SHA-256: c3d28551cb34b27b6fad20f5908089c0296c99372dcbac76054b691dcce072a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. This suggests the document is designed to host or redirect to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://servingltda.com/userfiles/file/89449239710.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358449c2432---12999988390.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/46076993071.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/34953480657.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/nejeregagojelurezax.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wijexenobugijiw.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f801ae4544---povesevewupibub.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/tamibapiziledogu.pdfIn PDF document text
    • http://carbonelite.ru/file/54389345664.pdfIn PDF document text
    • http://halaljones.com/uploads/files/wixifav.pdfIn PDF document text
    • http://mweb.cz/images/file/vemogu.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/54383764832.pdfIn PDF document text
    • https://pindimana.in/uploads/file/mijeviribefo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/bexoxubujeganetubizu.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/luzibujojimi.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/konelevimevowenax.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/99081703807.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4d0192fbdfc44f9daa368428e5b851f7/99208990264.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a31bd536---53931068590.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zulirofog.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130261c0abf8---bapaxiper.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/26720558231.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/14681679096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=idle+frontier+mod+apkPDF 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_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 10536 bytes
SHA-256: 6c8f782b1772d3b553ff033ec2b6968319eb0c4686f8445334e6c7dddb426aaf
font_01_sfnt_off0000e419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE419 20784 bytes
SHA-256: c119514d0d494ca6b31ce9289153a5289d2bd5db998a458c4f23718c8e3dd778
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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