Malicious PDF — malware analysis report

Static analysis result for SHA-256 75889d3c88b50a17…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 19:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: cf0664f61eb6c4c7071ffc9c2562b9b7 SHA-1: b2e22a70c5de73b5abda41fd9aedd1b4272681c2 SHA-256: 75889d3c88b50a170fe1f46cc22695efefc73902d2a9ab9d0d06fd45e71adb2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample contains embedded JavaScript, which is often used to execute malicious code or redirect the user. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vydavatelstvoklett.sk/userfiles/file/26177485479.pdf In PDF document text
    • https://soccerauquebec.com/userfiles/file/ralowezupu.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e49d7e42b5e---10578236059.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd19128e64---74660895205.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/310199383.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/pokegemusedusurarid.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/witof.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/vujawufarinodepozo.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/ninutefemina.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107071422049702899bjwoj.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f76b474eeba---73092941719.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vp0to98m00g7v73sj325lcsb84/52056687472.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160abcd400f09f---tifako.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3f6e6059c08510c7a4d68b8f780c5e52/12410528246.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9863a9f49d---37494849164.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vtn46n8m5hcbcqkglfucoagoh6/pegokagoniredapuru.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/42148694161.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/opa62k0n18239cl7a7u221qc1j/25629661426.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/82537050875.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jutapojimarajofibagaruf.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/wuladeb.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/1198610956.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f8d4abf18f3fca7feee9ed6989cdc168/gokow.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/23041658424.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c6750fe60f20a167f022cd278cbd198e/18557806448.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/52594710218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=facilities+planning+4th+edition+tompkins+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_off0000c16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 11116 bytes
SHA-256: 1e1e4fca7ff46052968a30133dd96b10e098111b0b706b7f9f87bbf8b393dfd1
font_02_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 18000 bytes
SHA-256: 56810dda0bed10079eca50c08bc57b25fb58c68cb9804ba07e374674aaaa3d64