Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37ed4d7f10e386c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 03:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 224ed0163bc70d795db81cbb208ebc7f SHA-1: 610bff4645376ca34fb14347670d84ea7aac2690 SHA-256: e37ed4d7f10e386c173e90cf14efdf632a0e18de84f038dcc545410955c6f07f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://clinicaveterinariasangiacomo.it/userfiles/files/mipaxowawupejubomawip.pdf In PDF document text
    • https://dakhoathienhoa.net/images/files/munakuwunotebej.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/74122645615.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gubabirilarawokakeja.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/12514402024.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/57296864779.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/mavena.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/48039527717.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2f5c01cdd93fcce57f27dfa3eccfd59c/marasisavojozowafekejum.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zifeporofikes.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/pesesitifatu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/vitupijizowute.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/79553801213.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe65bc5fee---48220016617.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/sorovadosesimavubu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1da470b71582b0bbc9e5add0923acbac/tosasoxofomovuxirunijez.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c9f151e3590468a9c51d1268953efdae/37731562133.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/74690603381.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/48771426756.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/59011366086.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/zozuxafuwovaja.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/11068163771.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e5bd573c---pakafavajil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jamrock+enterprise+jobsPDF 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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 10840 bytes
SHA-256: ec6bc465d46b326d507f5e6c19e2c5dbc355cedb8e2b90a67303bc5f1c40d9ca
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 17068 bytes
SHA-256: efd7a0464528473537d4c15724689731110aa5e34a8df4836887b853fcae0b3f
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1