Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aad92c36f82eed…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 18:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e8cc32881359fd8c6a1f1ad705dd57d SHA-1: cd10f9852f892f73207b846a1ba68cebac625bdd SHA-256: e4aad92c36f82eed006d2beb31847b71dbadc49ee4fddc0dc480aaf9fc3c1905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ctyhoanongangiang.com/userfiles/file/79328429793.pdf In PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0c9753be---valepofabaradago.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/gapozofu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348688ced4a---44251385483.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/653d615dfe7a29a56159e829aa54a216/66797879909.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/fiwulemigixik.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210912045520.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/30622991817.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/12767084403.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/97002072648.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/bajitakegejuvitela.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/88768861382.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/09bc032e09750bb12a2f363320554068/ranezexokimavadi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/51394663919.pdfIn PDF document text
    • https://0900107678.com/upload/file/zeluvekezezorarewubogil.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e0e2ac6a151acd3c12222e1e05a05031/48926202849.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bofimelupufup.pdfIn PDF document text
    • https://timminsrenovations.ca/file/UZc7djatz3zCC2ov.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/pikajugabejaxete.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kurasozawiza.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28168951031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vnc+kali+linux+androidPDF 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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 17956 bytes
SHA-256: fad81bbf43c1530f30d8345fcd706fbbd56272f31aba8e921a1a99ce5922e6d3
font_02_sfnt_off000125ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AD 10228 bytes
SHA-256: ae56f8d554b87bc4dede096ea5e3e972e715ddcbc7198cb2065cd2fc274ce876