Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ceb4b3df79cb0a…

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 22:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fe632bc0fa0cab4a19f2e0b0e85c5a7 SHA-1: a7b6f8928d7a02171301b6a494c9d39d37e0566e SHA-256: 37ceb4b3df79cb0ab858da915c00bc179e29fba62a97600367271ba77010946e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=history+of+great+scientists+pdf PDF link annotation
    • http://efuturesthai.com/uploads/files/ruvojukutixe.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/fukak.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/puruza.pdfIn PDF document text
    • http://meta-min.com/files/59965019640.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/76226777815.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/53969615936.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/sewokuditadusunu.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/dugisizemuwituwedobime.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/08e37e6cc9b8df1ff8d1c377c5b620a6/36055671705.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160756901e0863---benumirenos.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/20661298332.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/30352881258.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5c3680781---91598273666.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/88413618018.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/dujeginemafu.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/12574208911.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8055333c90---zopotazuxug.pdfIn PDF document text
    • http://getdol.com/page_data/file/43749430876.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/xalexugemapasem.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/61650723922.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801efd4fdc6---xamerijuzewaxeteropi.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/kerosaxano.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/begofejanal.pdfIn PDF document text
    • 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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 17376 bytes
SHA-256: 399b5dd26a92db3913108295c4eee1c009da310bc10cfcf44c6861e89e913f47
font_01_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 10852 bytes
SHA-256: 95c33111f565c4210ca916b7e8b0a58fb642f19a98341e2d8058cbe9f9fd8d00
font_02_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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